The large amount of waste plastics produced by human activities has brought serious pollution to the air,soil and sea in all fields.And even microplastics in the environment enter the human body through biological circulation,causing great harm to human health.According to the current recycling status of waste plastics,the research progress on several chemical recycling methods and new recycling processes for chemical recycling of waste plastics with sustainable development prospects were reviewed, mainly including solvolysis,hydrogenolysis,photocatalytic degradation.The catalytic degradation methods adapted to different types of waste plastics and the important role of various catalysts in the catalytic degradation reaction were summarized.And the catalytic efficiency of the main current catalysts was compared to provides a theoretical basis for the selection of effective catalysts and methods for the efficient degradation of waste plastics.

This paper discusses the reaction mechanism of methane dry reforming (DRM),including the microscopic mechanism of the key steps and the main factors affecting the reaction path.The properties and characteristics of various catalysts used for DRM,including metal oxide and metal carbide as support catalysts,and precious metal and Fe,Co,Ni as active component,are comprehensively evaluated,and their advantages and disadvantages in catalytic activity,selectivity and stability are analyzed.In addition,this paper also focuses on the mechanism of additives in improving catalytic performance,and how to optimize the overall performance of catalysts by regulating the type and dosage of additives.Finally,the application status of methane dry reforming technology in industrial production is summarized,and the future development direction is proposed.

Proton exchange membrane fuel cell,as a new type of energy conversion device with high energy density,friendly environment,fast starting speed rate at room temperature and long life,is the first choice of automobile power new energy battery.The catalyst is the key factor affecting the activation polarization of proton exchange membrane fuel cells.In this study,mass fraction of 50%Pt/C catalyst was prepared by using acetophenone semicarbazone as modifier and tetrammineplatinum chloride as active component.The preferred catalyst has a specific mass activity of 217.64 mA·mg^-1 and an electrochemical active area of 87.63 m²·g^-1 for electrochemical activity test.After 30 000 cycles of durability test,the specific mass activity and the electrochemical active area have only declined by 11.57% and 15.63%,respectively.

The study of carbon dioxide(CO₂) hydrogenation to methanol is significant for China to alleviate the energy pressure and achieve carbon peaking and carbon neutrality goals.In this reaction,the design and optimization of the catalyst are the essential elements in determining the CO₂ conversion and methanol selectivity.Alloy catalysts show extraordinary potential in promoting CO₂ activation and hydrogenation process due to their unique electronic structure and geometrical configuration.This review comprehensively surveys the advancements in solid-solution alloys and intermetallics,particularly Cu-based,In-based,Ga-based,and other emerging alloy systems,for heterogeneous catalysis of CO₂ hydrogenation to methanol.This paper also analyzes the current research strategies and ideas.It looks forward to the potential future directions and applications of alloy catalysts,aiming to provide valuable insights for researchers in related fields.

As a new large-scale energy storage technology,all vanadium redox flow battery has the advantages of high safety,adjustable power and capacity,long life,recyclable electrolyte and environment-friendly,but the solubility of vanadium ions in electrolytes is poor,which limits its large-scale application.The preparation of high concentration and high stability electrolyte is one of the key technologies of all vanadium redox flow battery.In this paper,the preparation method,concentration analysis and performance optimization of the electrolyte are introduced.

Polyoxometalates(POMs),as a type of multinuclear coordination polymer,have found extensive applications in catalysis,adsorption,and electrochemistry due to their unique structures and excellent physicochemical properties.However,the solubility of POMs in polar solvents has limited their application scope.To address this issue,researchers have developed POM-based composites.This review summarizes the latest research progress of POMs-based composites in the fields of biomass conversion,pollutant treatment,and electrochemistry.Studies have shown that these composites exhibit significant advantages in enhancing catalyst stability,promoting the transformation of biomass macromolecules,improving the efficiency of wastewater treatment and gas purification,and improving electrochemical performance.These achievements not only overcome the problem of POMs’ solubility but also provide new ideas and directions for technological innovation and applications in related fields.

Residual oil hydrogenation technology is an important means of light utilization of heavy oil.Under the background of increasingly heavy and inferior heavy oil raw materials,residuum hydrogenation technology is mainly faced with high cost,short plant operation cycle,equipment engineering and process operation difficulties.The development and application of fixed bed,boiling bed,slurry bed and combined residual oil hydrogenation technology are reviewed.Upflow and combined residuum hydrogenation technology may become the mainstream technologies in the future development to meet the needs of deep conversion of heavy oil,improve liquid yield and clean production,and assist the product structure transformation of refining enterprises to improve the market adaptability of refineries.

Due to the unique pore structure and excellent performance,porous ceramics have broad application in moisture sensitivity,gas sensitivity,filtration,sound absorption,heat insulation and catalytic carrier,especially in the field of environmental catalysis.Compared with catalyst powder alone,the supported porous ceramic catalysts have the advantages of large specific surface area,high catalytic activity,easy recovery,high carrier strength and corrosion resistance,which has become a research focus in recent years.The research progress of porous ceramics in catalytic treatment of volatile organic compounds,automobile exhaust gas,flue gas,printing and dyeing wastewater,and other organic wastewater degradation was reviewed,and the problems and development trends were prospected.

Efficient and acid stable oxygen evolution reaction (OER) catalysts are crucial for the large-scale application of proton exchange membrane (PEM) electrolysis technology coupled with renewable energy to produce green hydrogen.In this work,a series of iridium cobalt oxide catalysts with different iridium contents are prepared through a simple one-step molten salt thermal decomposition method followd by optimization.Electrochemical tests have shown that,compared with the rapid deactivation of cobalt oxide,the optimzied Ir_0.13Co_0.87O_x catalyst has an overpotential of only 270 mV at a current density of 50 mA·cm^-2,and can stably work for more than 50 h at a high current density of 100 mA·cm^-2.The study of structure-activity relationship shows that the uniform doping of iridium in the bulk lattice of cobalt oxide improves the stability of the catalyst and greatly reduces the impedance of charge transfer.At the same time,Ir replaces some of the tetrahedral coordinated Co²⁺ in Co₃O₄ with an average valence state slightly higher than +4,resulting in the catalyst surface prevails stable and high valence Ir⁴⁺ and Co³⁺ both in tetrahedral and octahedral form,hence greatly improving the activity and stability of the catalyst.This work reveals that the coordination structure and valence state of Ir in doped transition metal oxides play a crucial role in improving the OER activity and stability,hence provides a new solution for the development of efficient and stable low iridium based OER electrocatalysts working in acidic media.

Metal nanoclusters have attracted widespread attention in electronic structure,optics,electronics,magnetism,catalysis and other fields due to their unique quantum size effects and electron confinement effects.The surface protective ligands not only play the role of coordination protection,but also have important effects on the structure and physicochemical properties of metal nanoclusters.In addition to the most common protective ligands such as sulfur and phosphine,metal nanoclusters anchored by organic carbon (organometallic nanoclusters) have become a focus of research for researcher due to their various coordination modes,strong reaction and catalytic activity.In this paper,organic carbon ligands are mainly divided into N-heterocyclic carbene ligands with single coordination sites and conjugated aromatic rings or olefin and alkynyl ligands with multiple coordination sites.The synthesis methods,structures and catalytic applications of organometallic nanoclusters anchored by organic carbon with definite structure are summarized,which has providing references for the further study of organic metal clusters.

The hydrogenation of unsaturated compound is an important process of chemical processing that is widely used in the fields of oil refining,medicine,flavor,and so on.Heterogeneous catalytic reactions with porous organic polymers(POPs) as catalyst supporters possess the advantages of recyclable catalysts and mild reaction condition.The recent progress of POPs in olefins hydrogenation,alkyne hydrogenation,aldehyde-ketone hydrogenation,aromatic ring substitution hydrogenation and CO₂ hydrogenation was summ-arized.The challenges and future development directions were also put forward.

Catalytic transformations of syngas into high value chemicals is of great significance for improving the efficiency of carbon resource utilization.This review highlights the latest developments and challenges in direct synthesis of olefins and aromatics from syngas.The content covers the active site design,product distribution regulation,C—O activation and C—C coupling.In the future,the effective regulation of product selectivity can be realized by controlling the efficient synergy between activation of C—O and C—C coupling,and precise control of carbon chain termination behavior.

Methylphenol is an important fine chemical intermediate,widely used in new materials,medicine,pesticides,spices,additives and other fields.The alkylation reaction of phenol and methanol has the advantages of high efficiency,environmental friendliness and high product purity,which is the most economical production process of methyl phenol.The reaction is divided into liquid phase and gas phase.The liquid phase reaction is mainly carried out in the kettle reactor,while the gas phase reaction is mainly carried out in the fixed bed reactor.The catalyst can be divided into oxide and molecular sieve systems.The multi-component composite oxide catalyst has ideal reaction performance and high ortho-selectivity,but the reaction temperature is high.Molecular sieve catalyst has certain advantages in shape selection,but it is easy to accumulate carbon and deactivate.The acid-alkalinity of the catalyst is an important index,and their synergistic effect directly affects the selectivity of C-alkylation,otherwise it will increase the selectivity of side reactions such as O-alkylation products.In order to meet the demand for high-performance products in the fields of new materials and electronic chemicals,it is still necessary to further develop high-performance phenol methylation catalysts to improve the competitiveness of related industries.

A series of alumina precursors were prepared by nitric acid method using NaAlO₂ as raw material,and α-Al₂O₃ was obtained by calcination at high temperature.The supported palladium catalyst was prepared by incipient impregnation and their performance of CO oxidation coupling to dimethyl oxalate was evaluated on a fixed bed reactor.The texture and surface properties of the samples was characterized by XRD,BET,SEM,NH₃-TPD and H₂-TPR.The results showed that the precursor was prepared at gelation temperature of 55 ℃,pH of 7.0,and NaAlO₂ concentration of 0.8 mol·L^-1.The α-Al₂O₃ carrier prepared by the precursor calcined at 1 200 ℃ has high specific surface area,suitable surface acidity,suitable pore size distribution and large porosity.On a palladium-based catalyst prepared with this support,the conversion rate of methyl nitrite (MN) was 87.4% and the selectivity of dimethyl oxalate (DMO) was 96.1% at 3 000 h^-1,130 ℃,and CO/MN ratio of 4:1.

As the third largest greenhouse gas followed by CO₂ and CH₄,N₂O has been increasing year by year due to its inevitable generation and emission in the processes of ammonia oxidation in nitric acid production,SCR purification of NO_x,and ammonia combustion.Therefore,the purification and elimination of N₂O are particularly crucial.Direct catalytic decomposition has emerged as one of the most promising methods for reducing N₂O emissions due to its high efficiency and no secondary pollution.This article first provides a detailed review of the research progress of N₂O decomposition catalysts in recent years,reviewing the practical application and future development trends of N₂O high-temperature decomposition catalysts (two-stage catalysts) in the nitric acid production,focusing on the research trends of three major types of N₂O low-temperature decomposition catalysts,such as precious metal catalysts,Co-based oxide catalysts,and Co or Fe-based molecular sieve catalysts,and summarizing the advantages and disadvantages of these catalysts.In addition,a simple discussion is provided on the decomposition mechanism of N₂O on typical Co and Fe-based catalysts.Selective catalytic reduction as one of the main technological routes for elimination of N₂O is also compared using different reducing agents such as CO,H₂,alkanes,etc.Finally,it identifies existing issues in current catalytic systems and outlines future prospects for N₂O catalytic decomposition.

On the basis of ZrO₂ catalyst doped with Si and La,this article introduces the pore forming agent polymethyl methacrylate(PMMA) in different ways to regulate the acidity,alkalinity and pore properties of the catalyst,and improve the conversion and selectivity of the gas-phase selective dehydration of 1,4-butanediol(BDO) to prepare 3-buten-1-ol.Through X-ray diffraction(XRD) for phase analysis,and characterization results such as Fourier transform infrared spectroscopy(FT-IR),NH₃ temperature programmed adsorption(NH₃-TPD),and CO₂ temperature programmed adsorption(CO₂-TPD),it can be seen that the pore forming agent PMMA can significantly improve the dispersion of Si and La elements,thereby enhancing the acidity and alkalinity of the corresponding catalyst.At the same time,characterization results such as N₂ physical adsorption-desorption curves and scanning electron microscopy(SEM) showed that the pore forming agent PMMA changed the microstructure of the catalyst,improved its performance,especially ZrO₂-DPM catalyst,and ultimately achieved a conversion of 85.36% for 1,4-butanediol and a selectivity of 64.56% for 3-buten-1-ol.

1,1,2-Trifluoroethylene (HFO-1123,TrFE),as a novel hydrofluoroolefin (HFO) refrigerant,possesses an Ozone Depletion Potential (ODP) of zero and a 100-year Global Warming Potential (GWP₁₀₀) value of merely 0.005,rendering it environmentally benign and suitable for diverse applications.This attribute has garnered substantial attention from scholars and experts worldwide.Notably,the catalytic cleavage of 1,1,1,2-tetrafluoroethane (HFC-134a) to yield HFO-1123 not only mitigates the greenhouse impact associated with HFC-134a, but also addresses the issue of its surplus production capacity.This article systematically reviews recent domestic and international advancements in the research on the dehydrofluorination of HFC-134a to synthesize HFO-1123,encompassing the categorization,discussion,and summarization of catalyst types,preparation methods,and diluent gases.The aim is to provide a comprehensive reference for future investigations into the dehydrofluorination of HFC-134a for the production of HFO-1123.

The commercial application of self-developed THFS-2 catalyst in a 200,000 TPY deep catalytic cracking (DCC) unit in Yulin Refinery of Yanchang Oil Group is introduced.The physicochemical structure of THFS-2 hydrogenation catalyst was characterized by BET,XRD and H₂-TPR,and the reason of its high hydrogenation activity was revealed.The pilot experiment and the industrial application show that the THFS-2 hydrofining catalyst has excellent activity and stability in the treatment of deep catalytic cracking (DCC) gasoline with high sulfur,high nitrogen,high olefin,high diolefin and high aromatics.The product with mass fraction of sulfur and nitrogen less than 1.0 μg·g^-1 and value of bromine less than 0.5 gBr·(100g)^-1 can be produced.All the indexes are better than the requirements of aromatics extraction feed.Compared with the previous cycle reference agent,the average temperature of the reactor is reduced,the reaction temperature rise is stable and controllable,and the device can run stably for a long period.

This review summarizes the catalytic properties and the challenges associated with carbon accumulation in four reforming reactions:dry reforming of methane (DRM),steam reforming of methane (SRM),partial oxidation of methane (POM),and autothermal reforming of methane (ATR).It emphasizes the research advancements aimed at mitigating catalyst deactivation and carbon accumulation.Catalyst performance varies among the different reforming reactions,influenced by specific reaction conditions and catalyst composition.The existing solutions are classified into three strategies:(1) utilizing alkaline carrier materials or bimetallic catalysts to minimize carbon deposition and enhance catalyst stability;(2) employing noble metal catalysts to improve stability and carbon resistance,while optimizing non-precious metal catalysts through precise control of reaction conditions and formulations;and (3) designing multi-phase catalyst systems or catalysts with anti-sintering properties to extend catalyst lifespan and enhance reaction efficiency

Excessive emissions of carbon dioxide have caused serious environmental problems,especially global warming and ocean acidification.The electrocatalytic CO₂ reduction reaction (CO₂RR) is one of the most promising methods for converting CO₂ into high-energy-density fuels or high-value chemicals. Because of their low cost and high selectivity for C₃ products,copper-based catalysts have garnered a lot of attention as efficient electrocatalysts for the reduction of carbon dioxide to multi-carbon compounds.This paper summarizes the research progress of copper-based catalysts for CO₂RR to generate C₃ products in recent years,including the reaction mechanism of CO₂RR to generate C₃ products,and improving the electroreduction performance of copper-based catalysts through structural regulation,surface regulation,bimetallic and other strategies.Finally,the key challenges and future research directions in this field are outlined to provide ideas for further development of highly active CO₂RR catalysts to generate C₃ products.

Selective hydrogenation of acetylene is a key technology for removing trace acetylene impurities in the refining process of ethylene.The core challenge lies in developing a catalyst system that combines high activity,high ethylene selectivity,and long-term stability.This paper systematically reviews the research progress of palladium-based,gold-based,nickel-based,and copper-based catalysts in recent years,focusing on the effects of nanosizing of active components,bimetallic synergistic effects,carrier interface regulation,novel preparation methods,and additive modification on catalyst performance.Further,it summarizes the deactivation mechanisms of catalysts and anti-carbon deposition strategies,and proposes that future hydrogenation catalysts should focus on the development trends of enhanced low-temperature activity,high dispersion of active components,and long-term stability,providing theoretical guidance for the large-scale preparation of efficient,stable,and low-cost industrial catalysts.

Liquid organic hydrogen carriers (LOHCs) are recognized as excellent long-distance and large-scale hydrogen storage and transportation mediums due to their high hydrogen storage capacity,environmental friendliness,safety,and efficiency.The methylcyclohexane-toluene (MCH-TOL) hydrogen storage system has become an important research direction in the field of hydrogen energy due to its reversibility,high hydrogen storage density (6.16%),and relatively low toxicity.However,the lack of efficient dehydrogenation catalysts poses a bottleneck for industrial application,especially for non-precious metal catalysts,which face challenges such as high reaction temperatures,low selectivity,and poor stability.Designing stable,efficient,and cost-effective dehydrogenation catalysts is crucial to address this issue.This review summarizes the advantages of organic liquid hydrogen storage technology and the current research status of MCH dehydrogenation catalysts.It discusses the design strategies for precious metal Pt-based and non-precious metal Ni-based catalysts from five aspects:metal alloying,addition of promoters,optimization of catalyst supports,addition of surface promoters,and the synergistic effects of new technologies like microwave and electric fields on catalysts.In the future,mixed oxides loaded with multiple active centers as catalysts,particularly Ni-based catalysts with multi-metal synergistic effects to replace Pt-based catalysts,combined with auxiliary methods like microwaves and electric fields,will be the focus of dehydrogenation catalyst research.

Propylene oxide (PO) is an important chemical intermediate mainly used in the production of various organic raw materials such as polyether polyols and propylene glycol,and is widely used in fields such as food and tobacco.The use of titanium silicon molecular sieve (TS-1) as a carrier to load metal gold as a catalyst for gas-phase epoxidation of propylene has broad industrial application prospects.This article mainly introduces the main factors and catalytic mechanism that affect Au/TS-1 catalyst,including the preparation method of the catalyst,gold particle size,and additives.The main preparation methods include immersion method,sedimentation precipitation method,solid grinding method,ionic liquid method,and colloid method,among which sedimentation precipitation method is currently the mainstream laboratory preparation method for catalysts.The main influence of gold particle size is reflected in the 2 nm gold catalytic effect,which is most favorable for the occurrence of propylene epoxidation reaction.The main additives are alkali metals Na and Cs,which can improve the catalytic performance of the catalyst.The Au/TS-1 catalyzed epoxidation of propylene mainly relies on the dual site synergistic catalysis of Au and Ti sites.How to prepare high-performance Au/TS-1 on a large scale is currently the main difficulty in the industrial application of propylene hydrogen phase epoxidation to produce propene oxide.

The rapid development of electric vehicles and energy storage industries has led to a sharp increase in lithium demand.In the process of oil and gas extraction in China,a large amount of lithium containing oilfield brine is generated,which has potential resource utilization value.And conducting research on lithium extraction technology from oilfield brine has enormous economic benefits.Selective adsorption method is a promising technology for lithium extraction from oilfield brine with good industrial application prospects.Lithium ion sieve materials are currently the main adsorbents for achieving selective lithium extraction,determining the economic and industrial feasibility of the adsorption and extraction process.The mechanism of lithium extraction,preparation method,forming technology and adsorption of lithium extraction by lithium ion screen materials were systematically reviewed,and the future research direction are summarized and prospected,providing certain technical reference for achieving efficient utilization of lithium resources in oilfield brine.

The process flow and reaction mechanism of the MTBE unit of Sinopec Quanzhou Petrochemical Co.,Ltd.were presented briefly.The process parameters of the MTBE unit were studied using orthogonal experiments.The results showed that the optimal process parameters for the MTBE unit were etherification tower pressure of 0.52 MPa,reactor space velocity of 1.26 h^-1,and alcohol to olefin ratio of 1.30.Through experimental verification,the content of MSBE in MTBE products decreased from about mass fraction of 1.5% to below 0.6% after the optimization of process parameters.Replacing the original catalyst in etherification distillation column with CDM catalytic distillation module could effectively reduce the generation of MSBE.

Propylene oxide (PO) is a crucial chemical raw material,and the selective direct oxidation of propylene to epoxypropane holds significant importance in the chemical industry.This study investigated the homogenous catalytic system utilizing acetylacetonate metal salts in the propylene epoxidation with cumene hydroperoxide (CHP) as the oxidant.Under optimized conditions of propylene (24 mmol),cobalt acetylacetonate (0.16 mol%),CHP (15 mmol),ethyl acetate as the solvent (20 mL),and a reaction temperature of 95 ℃ for 2 h,the experimental results yielded a propylene conversion rate of 5.2% and a selectivity for epoxypropane of 85.5%.Electron spin resonance experiments indicated that the presence of cobalt acetylacetonate effectively increased the concentration of peroxyl radicals,enhancing the epoxidation activity of CHP and improving the affinity between the active oxygen species of CHP and the C＝C bond of propylene.This results in a higher selectivity for the conversion of propylene to propylene oxide.

Taking ExxonMobil for example,this paper examined the patent application trends and technical routes for the related patents of metallocene polyethylene as cataloged in the Derwent patent database.By February 29,2024,ExxonMobil has submitted 175 patent applications related to metallocene polyethylene,including 59 in China.The analysis revealed that ExxonMobil has a comprehensive patent layout,including metallocene catalyst designs,polymerization processes,applications and modifications of metallocene polyethylene.The patent layout of ExxonMobil in China was basically consistent with that in the world.However,ExxonMobil emphasized catalyst design in its global layout,and payed more attention to application technology in its patent layout in China.Combined with the analyzed results above,some suggestions were given for domestic relevant enterprises and research institutions to deploy technical forces.

Biomass is a resource-rich,environmentally friendly,renewable and cheap resource.There are many researches on catalytic cracking of biomass to produce bio-oil,but the industrial application of bio-oil to light olefin is still in the early stage of research and development.Improving the yield of light olefin is one of the core problems to be solved in the research process of bio-oil to light olefin.The deep catalytic cracking process of palm oil to light olefins was studied.The results showed that the yield of ethylene,propylene and butene were 7.62%,19.80% and 12.14% under the reaction temperature of 620 ℃ and the ratio of catalyst to oil 7.5 with PTO catalyst.With the increase of reaction temperature and the ratio of catalyst to oil,the conversion rate increases,the yield of ethylene and propylene increases,the yield of coke decreases,and the RON of gasoline increases.

Three oxidizing catalysts were prepared by using Al₂O₃ as the carrier and regulating the content ratio of active components Co and Mo.On this basis,pre-sulfurized hydrotreating catalysts were prepared by introducing sulfurizing agent.At the same time,the desulfurization performance of the 2-4# catalyst with good performance in coke oven gas was investigated under different reaction conditions.The results showed that the best organic sulfur conversion was achieved at the CoO/MoO₃ mass ratio of 0.4,the reaction pressure of 2 MPa and the temperature of 350 ℃.Under the same preparation conditions,the organosulfur conversion of the ex-situ presulfurization catalyst was 1.69% higher than the in-situ presulfurization catalyst,and the catalyst was stable in long-term use,which is promising for market application.

The mass hydrogen storage density of methanol is up to 12.5%,which can be used as a hydrogen energy carrier to realize the rapid release and utilization of hydrogen.Methanol reforming to produce hydrogen is an important means to realize the green production and efficient storage and transportation of hydrogen energy,and the catalyst is the key to realize this process.In this paper,the current research progress of Cu-based catalyst used for hydrogen production through methanol steam reforming is reviewed.Building upon existing studies,combing catalyst bulk optimization with microreactor is proposed to prepare a novel catalyst,which is expected to further overcome the defects of Cu-based catalyst and improve the comprehensive properties of catalyst,thus promoting the improvement of hydrogen yield and reduce CO selectivity,laying the foundation for the further development of hydrogen energy technology.

Methanation of carbon dioxide is an effective way to convert and utilize carbon dioxide.In response to the low activity of carbon dioxide methanation catalysts,this article uses nickel as the active component and in-situ growth method to prepare a multi metal component high activity carbon dioxide methanation catalyst La₂NiCoO₆.Through SEM and BET characterization,it was found that adding La element can improve the dispersion and pore structure of nickel based catalysts,which is beneficial for enhancing their activity.The catalyst La₂NiCoO₆ was investigated under different process conditions,and it was found that the conversion of carbon dioxide was 91.21% and methane selectivity was 97.63% under the process conditions of reaction temperature 400 ℃,atmospheric pressure,gas space velocity 12 000 mL·(g·h)^-1,and n(H₂)∶n(CO₂)=4,indicating that the catalyst has high activity at low temperature.And the catalyst La₂NiCoO₆ still maintains relatively high activity and stability within a 300 hour activity cycle.

In this paper,Ag/CuO/GO nanocomposites were synthesized by solution method.The peroxidase activity and kinetic stability of the composites were studied with 3,3',5,5'-tetramethylbenzidine (TMB) as substrate.The antibacterial activity of the composites against Escherichia coli and Staphylococcus aureus was studied by plate counting method.The results showed that the Ag/CuO/GO nanocomposites had good peroxidase activity,and their Michaelis constant for substrates TMB and H₂O₂ were lower than those of natural HPR peroxidase.In the process of antibacterial experiment,Ag/CuO/GO composites can catalyze H₂O₂ to produce hydroxyl radicals (·OH) with excellent bactericidal effects,thus significantly improving the antibacterial activity of the nanocomposites.

Self-prepared θ and γ phase Al₂O₃ were used as supports to synthesize Pt-Ga/Al₂O₃ bimetallic catalysts via the incipient wetness impregnation method.The catalysts were characterized using XRD,N₂ adsorption-desorption,and NH₃-TPD techniques.The catalytic performance of these catalysts for the dehy-drogenation of methylcyclohexane was evaluated in a fixed-bed reactor.Results showed that the catalyst supported on θ-Al₂O₃ exhibited lower acidity,larger pore size,and more uniform dispersion of active metals.The addition of Ga as a promoter further improved the performance of the bimetallic catalyst,demonstrating excellent stability with a hydrogen evolution rate of 0.283 mol·(g_Pt·min)^-1 after 60 hours of continuous operation.

The effect of nano-aluminosilicate additives (halloysite,imogolite,and allophane) in hydroformylation of mixed butene in water-oil phase was studied.This reaction is catalyzed by an aqueous catalytic system,which is composed of acetylacetone rhodium dicarbonyl and triphenylphosphine trisulfonate sodium salt (TPPTS).The results show that nano-aluminosilicate additive can promote the formation of stable oil-water lotion.The catalyst can achieve effective interfacial catalytic effect in this stable oil-water lotion,which can significantly promote the conversion of mixed butene and normal/isomeric aldehyde ratio.After the reaction,the oil and water phases can be quickly separated in a short time after the aluminosilicate additives are removed by simple filtration,thus achieving efficient separation of the product from the catalyst.The study also found that adding inorganic salt additives such as ammonium molybdate tetrahydrate,ammonium chromate,and ammonium dichromate to the reaction can further enhance the catalytic activity.

In this paper,the effect of Al₂O₃ carriers calcinated at different temperatures on Cr₂O₃/Al₂O₃ catalysts was investigated.The carriers and catalysts were analyzed and characterized by XRD,nitrogen adsorption and NH₃-TPD.The results show that the pore structure and surface acidity of the carriers were different when the calcination temperature of the carriers were different,which led to the different conversion,selectivity and stability of the catalysts.When the calcination temperature of the carrier was lower,the specific surface of the carrier was larger,the number of surface hydroxyl groups was higher,and the catalyst had higher conversion,lower selectivity and better stability for the isobutane reaction.When the calcination temperature of the carrier was higher,the specific surface of the carrier was smaller,and the number of surface hydroxyl groups was lower,and the catalyst had lower conversion,higher selectivity and worse stability for the isobutane reaction.

MoS₂/ZnO composite photocatalyst was synthesized by hydrothermal method.The composition and morphology of as-prepared photocatalyst were tested by infrared spectroscopy,X-ray powder diffraction,scanning electron microscopy and UV diffuse reflectance spectroscopy.The results show that the lamellar MoS₂ is attached to the rod-like ZnO surface,and the light absorption capacity of the composite is enhanced to a certain extent in the visible region.For light irradiation of 120 min and the mass fraction amount of MoS₂ was 1.5%,the degradation efficiency of MoS₂/ZnO(MZ-3) for 15 mg·L^-1 tetracycline was up to 90.01%,which was higher than that of pure ZnO.Five cycle stability test experiments showed the stable photodegradation performance of the composite catalyst.

Epoxidation of olefin is an important part of industrial production of high value-added chemical monomers.Howere, traditional thermal catalytic methods not only consume a large amount of energy but also generate high carbon emission due to side reactions, resulting in poor economic benefits.The renewable green electricity drives the electrocatalytic epoxidation of olefin,which provides a new way to prepare high value-added epoxy intermediates in the industrial field.The research progress of electrocatalytic olefin epoxidation was reviewed,including different catalytic systems,catalytic mechanisms,influencing factors and strategies to improve catalytic performance.Finally,the existing problems and future development directions in this field were pointed out,hoping to provide some research references for the design of electrocatalysts,electrode materials and electrolyzers in olefin epoxidation system.

A series of isomerization catalysts for n-butane were prepared by equal-volume impregnation method.The effects of reaction temperature,Pt loading and La modification on the reaction were investig-ated by fixed bed apparatus.The results show that the yield of n-butane is the highest when reaction pressure is 2.4 MPa,hydrogen-hydrocarbon ratio is 3,space velocity is 2 h^-1,reaction temperature is 280 ℃ and Pt loading is 0.05%.La was further introduced into Pt/Cl-Al₂O₃ catalyst by co-impregnation method to improve the catalytic performance of n-butane isomerization.The characterization results showed that the addition of La did not change the surface physical properties of the catalyst,but significantly improved the dispersibility of the active metal Pt,high isobutane yield and good catalyst stability,which provides technical support for industrial application and promotion.

Metal-organic frameworks(MOFs),as a novel type of hybrid porous materials,exhibit diverse structures,tunable porosity,high specific surface area,unsaturated active sites,and ease of chemical modification,making them widely applicable in fields such as storage and catalysis.In this study,Cu-BTC was synthesized via a hydrothermal method and further modified using vapor-phase substitution to prepare Cu-Zn-BTC adsorbents.The synthesized materials were characterized using XRD,SEM-EDS,BET,and FT-IR techniques.Static adsorption desulfurization experiments were conducted using a model oil (dibenzothiophene in n-octane) to evaluate the desulfurization performance of Cu-BTC and Cu-Zn-BTC.Results demonstrated that under optimal conditions(120 min, 30 ℃),Cu-BTC achieved a maximum adsorption capacity of 38.64 mgS·g^-1 and a desulfurization efficiency of 85.87%.In contrast,Cu-Zn-BTC exhibited superior performance under optimized conditions (70 min,30 ℃),with an adsorption capacity of 57.54 mgS·g^-1 and a desulfurization efficiency of 95.90%.These findings highlight the promising prospects of MOF-based materials in adsorptive desulfurization of fuels.