At present,China’s crude oil imports and foreign dependence are high,so it is of great significance to make full use of the relatively abundant domestic coal resources and convert them into liquid fuels by catalysis,in which the catalytic conversion of syngas is the key link.Therefore,the important research progress on catalytic conversion of syngas in recent years is reviewed.The expanded application and innovative research of molecular sieve in the field of catalytic conversion of syngas to light olefins,aromatic hydrocarbons,mixed alcohols,and liquid fuel are briefly described,and the development of catalytic conversion of syngas in the future is prospected.

Glycerol,as the major byproduct in biodiesel production,can transform to value-added products via different catalytic processes.Selective electro-,photo-,and photoelectrocatalytic glycerol oxidation to dihydroxyacetone (DHA),which widely used in cosmetic,pharmaceutical industries,etc.is one of the most promising reaction pathways.This review describes the recent research developments in selective electro-,photo-,and photoelectrocatalytic glycerol oxidation to DHA and special emphasis is put on the design of high-activity and high-selectivity catalysts.Furthermore,the challenges and future prospects in selective electro-,photo-,and photoelectrocatalytic glycerol oxidation to DHA are overviewed.

The production capacity and process routes used by the main domestic methyl methacrylate production enterprises are briefly introduced,and the advantages and disadvantages of each process route are analyzed.The research progress on heteropolyacid catalysts used in the selective oxidation of methacrolein to methacrylic acid was reviewed.The alkali metal modification,transition metal modification and catalyst loading on high specific surface area carrier of P-Mo-V heteropoly acid salt catalysts were mainly introduced.The synergistic effect of various metal active components and the loading of catalysts on high specific surface support are effective methods to improve the acidity,redox properties and catalytic efficiency of heteropoly acid catalysts.

New porous materials have the characteristics of adjustable pore size,high specific surface area and functional design.Through structural design and chemical modification according to different requirements,new materials with various morphologies and properties can be obtained,which makes them have good application potential in adsorption and separation,energy storage,catalysis and other fields.In this paper,the synthesis methods of organic porous materials(HCPs、PIMs、COFs、CMPs) and inorganic-organic hybrid porous materials(MOFs),their applications in the field of material adsorption and separation and catalysis are introduced,and the research hotspots and development trends in the future are prospected.

Magnetic titanium dioxide bismuth vanadate (Fe₃O₄-TiO₂-BiVO₄) composite photocatalysts were prepared from titanium oxide sulfate,ammonium metavanadate,and ferrous chloride reagents,and characterized by scanning electron microscopy (SEM),X-ray diffraction (XRD),Fourier infrared spectroscopy (FT-IR), and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS).The photocatalytic degradation of Congo red solution at a concentration of 20 mg·L^-1 was carried out under visible light irradiation using magnetic titanium dioxide vanadate of 0.05 g.The results showed that the photocatalytic degradation of Congo red solution was 70.0 % at 240 min of natural light.

A series of Cs/CuAl-LDO@zeolite catalysts were prepared by using X,Y,USY,mordenite,5A and ZSM-5 zeolites as supports.The CuAl-LDH were grown on the surfaces of the zeolites,and then impregnated with Cs and calcined.The structure and appearance of the catalysts were characterized by XRD,N₂ adsorption-desorption,SEM,NH₃-TPD and CO₂-TPD,and the catalytic performance of the catalysts for the side-chain alkylation of toluene with methanol was evaluated.The results showed that the appearance,specific surface area,acid-base sites and the performance of the side-chain alkylation of toluene over different zeolite-supported catalysts are different to some extent.The Cs/CuAl-LDO@X catalyst supported by X-zeolite had the best catalytic performance.When toluene conversion is 4.14%,the styrene selectivity is 51.10%,and the total selectivity of styrene and ethylbenzene is 91.79%.

This paper mainly studies the catalyst for the hydrogenation of 2,2,6,6-tetramethyl-4-piperidinone to 2,2,6,6-tetramethyl-4-piperidinol.This reaction was use as a probe reaction for the study of carbonyl hydrogenation to alcohol catalyzed by carbon-supported ruthenium-based metal catalyst.The purpose of optimizing the catalytic performance in the hydrogenation of 2,2,6,6-tetramethyl-4-piperidone can be achieved by adjusting the size of the active metal particles in the catalyst.The research on the structure-activity relationship of properties provides reference and support for the design and development of many carbonyl compound hydrogenation catalysts.

The thermal efficiency model of the gas-fired furnace for molecular sieve is established,and the effects of the mixed air on the thermal efficiency are analyzed.The furnace thermal efficiency is improved by furnace structure optimization,adjustment of operating parameters,and saving energy technology including coating high radiation material on the inner surface of the chamber and the outer surface of the cylinder,as well as coating insulating material on the outer surface of the furnace. The operation results show that the deviation between the simulation results and the operation results is within ± 2.5%.The thermal efficiency of the furnace is increased from 80.6% to 85.7% by energy saving technology,and 415 400 CNY annual operation cost is saved. It has created good economic benefits for enterprises.

The thermogravimetric properties,average pore size and pore volume,compositions of catalysts in SCR-system of a domestic waste incineration power plant before and after electric heating were investigated by TG,BET and XRF,taking fresh-catalyst as reference sample.The activity of catalysts were also studied in activity-evaluation-device.It is found that the silicate or sulphate which are difficult to be decomposed and vaporized below 400 ℃ maybe the reason for the deactivation of SCR-catalyst at low temperature in addition to SO₂ and H₂O.

In view of the deactivation of hydrogenation catalyst,the multi-dimensional micro analysis was carried out by combining scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS) based on the macro analysis of X-ray fluorescence spectrometer (XRF).The results showed that the increase of P,Si and Fe elements was the cause of catalyst deactivation from the XRF comparative analysis results;but the comparative analysis results of surface scanning,line scanning,point scanning and micro area scanning of SEM-EDS showed that impurities containing P,Si and Fe elements were abnormally deposited on the surface of the deactivated catalyst,especially the impurities containing P element,which led to catalysts’ deactivation by covering the catalyst surface or deposited in the catalyst channel.Based on specific research objectives,the effective combination of XRF analysis and one or more SEM-EDS combination means can provide “customized” analytical support for the analysis of catalyst deactivation.

The process conditions,raw material and product properties,conversion and energy consumption of domestic catalyst module and imported catalyst module of light gasoline etherification distillation tower are compared,and a brief energy consumption accounting is made.The results show that compared with the imported catalyst module,the domestic etherification catalyst module can increase the conversion of etherification distillation tower unit by about 20%,reduce the consumption of low-pressure steam by 3.98 t·h^-1,and reduce the cost by about 7.949 million CNY per year.

In methanol production plants,methanol synthesis catalyst is going to be sintered and poisoned due to the chemisorption of S-containing compounds and the Oswald ripening of copper nanoparticles.The reducing of active sites during the life cycle of one kind of commercial methanol synthesis catalyst commonly needs to increase reaction temperature to enhance the production capacity.Combining with the reaction temperature,the thermodynamic equilibrium changed as well,which influence the product purity of methanol.In reality,most of the methanol industrial plants are facing the difficulties of poor selectivity and even wax at the middle or end of a commercial catalyst’ life cycle.Here,we deeply studied the influence of reaction temperature on the product selectivity and proposed a method that helps to estimate the extent of waxing during industrial production.We believe it may also help the researchers on this field to better design a methanol synthesis catalyst.

This paper expounds various reasons that affect the service life of the catalyst for the synthesis of methyl tert butyl ether resin.Through the analysis of the reasons that affect the service life of the catalyst,a series of measures such as strict requirements for the quality of recycled methanol raw materials, adjusting the dehydration frequency,and strictly controlling the temperature of the catalyst bed of the reactor and catalytic distillation tower are adopted,and the service life of the catalyst in MTBE unit is prolonged.The cost is reduced and the efficiency is increased by 2.454 million yuan.

As one of the most widely used catalysts in industry,the ZSM-5 zeolite has been a hot spot for research.However,the conventional ZSM-5 zeolite suffer from large grains,diffusion difficulties and poor accessibility of active sites,which limit the application in macromolecular catalysis.The methods and mechanisms to improve the diffusion difficulties of zeolite by adjusting the gel chemistry and synthesis condition factors in recent years are reviewed,and it is pointed out that the use of long-chain quaternary ammonium salts as structural guides can synthesize ZSM-5 zeolite with self-pillared structure and good intercrystalline mesopore connectivity,but their preparation process is tedious and expensive.The introduction of additives such as urea and seeds and the successful application of two-stage crystallization method make the synthesis less costly,and the improved intergranular mesopores will make it have better diffusivity.

Solvent-free synthesis of molecular sieves has many advantages,such as low raw material cost,mild reaction conditions,simple synthesis route and green process,and has gradually become a research hotspot in recent years.This paper mainly studies the progress of molecular sieve synthesis by solvent-free method,the synthesis mechanism of molecular sieve,and the advantages and disadvantages of synthesis by solvent-free method.The application prospect and research trend of this synthesis are also prospected.

A quaternary ammonium-based porous hypercrosslinked ionic polymer (QA-PHIP) was prepared through Friedel-Cratfs alkylation using biphenyl phosphine ammonium chloride as monomer.QA-PHIP was characterized by various techniques such as Fourier transform infrared spectroscopy,scanning electron microscopy and nitrogen adsorption-desorption measurement.The results showed that the specific surface area of QA-PHIP was 903.7 m²·g^-1,and the CO₂ adsorption capacity was 52.1 cm³·g^-1 at 0.1 MPa and 0 ℃.Furthermore,QA-PHIP was applied to catalyze the synthesis of cyclic carbonates from CO₂ and epoxide,and the effects of parameters such as reaction temperature and catalyst dosage on the catalytic performance were systematically investigated. QA-PHIP displayed good catalytic performance of 99.6% conversion of epichlorohydrin and 97.3% yield of chloromethyldioxane at 120 ℃ and 1.0 MPa for 12 h.Moreover,QA-PHIP exhibited good substrate expansibility and reusability.

Glucose isomerization and epimerization are important catalytic reactions for biomass conversion and synthesis of rare sugars.The previous results have shown that Lewis acidic Cr-MIL-101 and Zr-UiO-66 catalysts deliver different catalytic function in glucose isomerization and epimerization,yet the mechanism and reason are unclear.Herein,Cr (Ⅲ) clusters and Zr (Ⅳ) clusters are employed as model units,and spin-polarized density functional theory are used to explore the transition states and energy barriers in the process of glucose isomerization and epimerization.The resultant effect mechanism of glucose transformation over different metal sites is elucidated.It is found that the elementary reaction steps involved over Cr-MIL-101 and Zr-UiO-66 are similar and undergo the hydride transfer and anti-hydride transfer also.However,because of different coordination activation mode between glucose and metal active centers,the activation energy of hydride transfer over Lewis acidic Cr (Ⅲ) clusters is lower than that of anti-hydride transfer,whereas it is contrary in the case of Lewis acidic Zr (Ⅳ) clusters.

High dispersion of Pt over TiO₂ would benefit its catalytic activity towards formaldehyde oxidation,thus supercritical fluid deposition (SCFD) was applied to prepare Pt/TiO₂ and the preparation process conditions were explored.The catalytic performance of the as-prepared Pt/TiNT and Pt/P25 was compared,and the catalysts were characterized by TEM,N₂ adsorption-desorption,TPR and XPS.The experiment results reveal that the catalysts prepared under cosolvent (V_ethanol∶V_glycol=1∶1),deposition time of 1 h,deposition temperature of 70 ℃ and Pt loadings of mass fraction of 0.4% exhibit high catalytic activity.The complete oxidation of formaldehyde was occurred on both catalysts at ambient temperature,with 82.4% purifying efficiency (about 100% degradation efficiency) on Pt/TiNT and 52.4% purifying efficiency (about 70.3% degradation efficiency) on Pt/P25 after 16 h.The characterization results show the tubular array structure of TiNT is more conducive to the effective dispersion of active components.Stronger interaction between Pt and TiNT,as well as more negative charge and oxygen vacancies,was also found on Pt/TiNT.All these are responsible for its high activity.

Free enzyme is expensive and unstable,and it is easy to be inactivated under high temperature,strong acid and strong alkali.Nano-mimetic enzyme has stable performance,low cost and enzyme-like activity.In this paper,a nano-mimetic enzyme (Cu-rGO) with catalase-like activity was prepared by synchronous reduction method,and magnetic nano-mimetic enzyme (Cu-rGO-Fe₃O₄) was prepared by loading magnetic nanoparticles.The spectral characteristics and conditions optimization were investigated,and finally it was used for the decomposition of H₂O₂.

Pd-Cu/Al₂O₃ and Pd-Cu-N/Al₂O₃ catalysts were prepared by co-impregnation method with Al₂O₃ as supports.The effect of nitrogen doping on the catalytic performance of Pd-Cu/Al₂O₃ catalyst for CO preferential oxidation in H₂-rich stream was studied by using a fixed-bed continuous flow reactor.The catalysts were characterized by XRD,FT-IR,H₂-TPR and XPS.Compared with Pd-Cu/Al₂O₃,Pd-Cu-N/Al₂O₃ has better CO preferential oxidation performance.The results show that nitrogen doping promotes the dispersion of Cu₂Cl(OH)₃ on the surface,enhances the interaction between Pd and Cu,and improves the redox ability of Pd and Cu₂Cl(OH)₃.At the same time,the addition of nitrogen is also conducive to the formation of more active Cu⁺ on the surface,and the interstitial nitrogen entering the lattice of Pd may inhibit the formation of PdHx in the reaction process,thus improving the catalytic activity of the Pd-Cu/Al₂O₃.

Porous organic polymers (POPs) have long been regarded as important porous materials for CO₂ adsorption and catalytic conversion and had huge application potential in cycloaddition of CO₂ and epoxides.In this paper,a class of crown ether-functionalized covalent triazine framework was prepared by aldehyde-amidine condensation reaction with dibenzo-18-crown ether-6 under mild conditions.When KI is used as a cocatalyst,it can efficiently and selectively convert CO₂ to cyclic carbonates under mild conditions without solvent,showing excellent catalytic performance and substrate universality.Finally,this kind of heterogeneous catalyst could be reused for five recycles without obvious decrease in activity,indicating a great potential of industrial application.

In recent years,the application of methyl tert-butyl ether (MTBE) has been limited due to the popularization of ethanol gasoline.Isobutene,as one of its raw materials,has to find another way out.Selective oligomerization to produce high-octane isobutylene dimers is a reasonable way to make use of the large amount of mixed isobutene in C₄ produced by catalytic cracking and steam cracking.Here,HZSM-5 was modified with Ni as additive.The effect of Ni loading on the catalytic performance was investigated and a series of catalysts were characterized.The results showed that the comprehensive effect was the best with the Ni loading was 0.25%(mass fraction),and the C₈⁼ yield is 45.4%.The characterization results showed that the ratio of Lewis acid (LA) and Brönsted acid (BA) of the strong acid sites of HZSM-5 was increased after Ni modification,which played an important role in improving the C₈⁼ selectivity.The LA centers may be derived from NiAl₂O₄ generated by the interaction between Ni species and aluminum in HZSM-5.

Solvent-free protocol for the selective aerobic oxidation of toluene to benzaldehyde catalyzed by cobalt porphyrin/N-hydroxy phthalimide (NHPI) under mild conditions was developed.Under the optimized conditions (toluene 0.2 mol,molar fraction of cobalt porphyrin 1´10^-4%,molar fraction of NHPI 0.25%,70 ℃,O₂ pressure 2.0 MPa,3 h),the conversion of toluene was 5.5%,and the selectivity of benzaldehyde,benzyl alcohol,and benzoic acid was 88.0%,10.2%,and 0.8%,respectively.Based on in situ characterizations such as infrared spectroscopy and electron paramagnetic resonance spectroscopy,the reaction mechanism involved free radicals was demonstrated.

The catalysts of nickel supported on C₃N₄(Ni@C₃N₄) were prepared by in-situ direct calcination and characterized by BET,XRD and TEM.The catalytic performance was investigated using p-chloronitrobenzene hydrogenation as probe reaction.The results showed that the catalyst had high activity,large specific surface area and two-dimensional stacking structure.The effects of reaction pressure and temperature on the hydrogenation of p-chloronitrobenzene were investigated for the catalysts with different nickel loads,and the stability of the catalysts was evaluated.The results showed that when the mass ratio of nickel salt to urea was 5∶5,the catalyst performance was the best.When the reaction pressure was 1 MPa and the temperature was 60 ℃,the catalyst showed excellent catalytic performance for the hydrogenation of p-chloronitrobenzene.The conversion of p-chloronitrobenzene was 99.9% and the selectivity of p-chloroaniline higher than 95%.The activity of the catalyst did not decrease significantly after 5 times of use.

Copper-based catalysts have excellent catalytic performance and broad application prospects in catalyzing olefin epoxidation reactions.At present,there is already a patent applied the supported copper-based catalyst to the gas-phase epoxidation reaction of hexafluoropropylene,and shows excellent catalytic performance.However,the induction period of the reaction and the significantly reduced activity of the catalyst in the later stage limit its further application and development.Therefore,in this paper,CuO/SiO₂ catalysts were prepared by the incipient wetness impregnation method.And the physico-chemical properties of CuO/SiO₂ catalysts were analyzed by characterization methods such as FT-IR,XRD,TEM and TG,and the reasons for induction period and inactivation in gas-phase epoxidation reactions of hexafluoropropylene were systematically studied.The results showed that Cu-F species were the active center of the reaction,and the species were produced by the reaction of raw gas (air and HFP) and CuO,which led to the emergence of the induction period.The main reason for the decrease in catalyst activity in the later stage of the reaction is the aggregation and growth of Cu particles.

We have established a catalytic pyrolysis system using rare-earth modified ultra-stable Y-type zeolite (ReUSY),and conducted catalytic pyrolysis experiments on various polyolefin plastics based on this system.The results demonstrated the superior catalytic performance of ReUSY zeolite among the tested catalysts.Utilizing the technique of thermogravimetric analysis coupled with real-time online infrared product analysis,it is observed that the incorporation of ReUSY zeolite significantly reduced the pyrolysis onset and termination temperatures of polyolefins,while concurrently decreasing the proportion of aromatic hydrocarbons and carbonaceous deposits,thereby enhancing the yield of low-carbon hydrocarbons. Furthermore,an investigation of the catalytic pyrolysis reaction kinetics was conducted using the Coats-Redfern method,wherein the activation energy during different stages of the catalytic pyrolysis process was analyzed.The average activation energy for the catalytic pyrolysis reaction ranged (56.23-69.12) kJ·mol^-1.Compared to conventional pyrolysis experiments,the incorporation of ReUSY zeolite remarkably lowered the activation energy of the catalytic pyrolysis reaction.

Co₃O₄-MMT catalysts with three different Co loadings were prepared by in situ polymerization-coordination deposition using MMT as support.The support and catalysts were characterized by N₂-physisorption,XRD and TEM techniques.Their catalytic performance for N₂O decomposition was investigated using a continuous flow microreactor.The results show that the specific surface area of Co₃O₄-MMT increased significantly and the active component Co₃O₄ possesses a higher dispersion state comparing with pure Co₃O₄ catalyst.The catalytic activities of Co₃O₄-MMT catalysts increase firstly and then decrease with the increase of Co content.0.015Co-MMT shows the best catalytic activity and its specific activity is much higher than that of pure Co₃O₄ catalyst.Meanwhile,the 0.015Co-MMT catalyst exhibits good catalytic stability and tolerance to impurity gases.

TiO₂ carrier has good catalytic performance,stable physical and chemical properties and non-toxic characteristics.The advantages of titanium dioxide as denitration catalyst carrier are introduced on the basis of catalyst carrier loading active components.The forming of titanium dioxide carrier and application of titanium dioxide carrier in denitration industry were reviewed.Pure titanium dioxide and titanium dioxide carrier loaded with vanadium,tungsten,rare earth cerium,etc. as denitration catalysts are two main applications of TiO₂.The future development direction will focus on improving the service life of titanium dioxide carrier,preventing titanium dioxide carrier poisoning and adding more active components,and improving the service life of denitration catalyst and denitration efficiency to meet the increasingly stringent environmental requirements of ultra-low emissions of flue gas and mobile source tail gas.

Aldol condensation of furfural with cyclopentanone is one of the important steps in preparation of the high-quality biofuels.The synthesis of renewable biofuels from biomass furfural and cyclopentanone is sustainable and meets the requirements of green chemistry.However,the catalytic mechanism of this reaction are not very clear.Under different catalysis,two products can be obtained,2,5-bis (2-furanylmethylene) cyclopentanone (F₂Cp) and 2-(2-furanylmethylene) cyclopentanone (FCP).In this paper,the catalytic performances of acid catalyst,base catalyst and acid-base bifunctional catalyst used in the reaction for target product of F₂Cp were analyzed.The analysis shows that both acidic Al₂O₃ catalyst and acid-base bifunctional Na-HAP catalyst have better catalytic performance.The microwave radiation method can increase the reaction rate under free solvent.On this basis,the catalytic mechanism is described and analyzed.The mechanism analysis shows that the acid-base synergism is beneficial to the aldol condensation reaction.Therefore,the design and preparation of solid acid-base bifunctional catalysts with appropriate acid-base ratio is the focus of the follow-up study of this reaction,and also provide some references for the aldol condensation reaction of other aldehydes or ketones.

The principle of adsorption and removal of benzene series by zeolite molecular sieves was described,and the methods,which including zeolite molecular sieve structure optimization,weakening hydrophilicity,cation compensation,pore multi-polarization,composite molecular sieve and so on, to improve the adsorption and removal performance of zeolite molecular sieves were discussed.When the flow rate is large and the pressure drop is high,the molecular sieve runner adsorption technology has high adsorption and removal efficiency for benzene series,and this technology is widely used in the industrial field.In addition,the problems to be solved in the adsorption and removal of benzene series by zeolite molecular sieves are improving hydrophobicity,stability and selectivity.

Molecular sieve catalysts are one of the most studied fluidized bed catalysts.Molecular sieve microsphere catalysts are typically prepared by spraydrying processes,which used double aluminum-based sol,silica-aluminum composite sol,phosphorus-aluminum sol,etc.as binders in industry.The fluidized bed catalysts required not only good catalytic performance,but also superiorattrition resistance,favourable sphericity and appropriate particle size distribution to match the actual industrial manufacturing.The attrition resistance,particle size distribution,sphericity and catalytic performance of molecular sieve catalysts are significantly affected by the selection of binders and supports,the slurry preparation processes,the inlet and outlet temperatures of the spraydrying processes,the atomizer speed and the post-processing of the catalysts.The current research progresseson improving the attrition resistance of fluidized bed molecular sieve catalysts (FCC catalysts and MTO catalysts are taken as examplesin this paper) are summarized from three aspects including optimization of catalyst slurry components,optimization of spraydrying processes and post-processing of catalysts,and provide some references for the research & development of other attrition resistant fluidized bed catalysts.

The hydrogenation of coal tar to produce clean oil is an effective method to realize efficient conversion of coal tar.With the continuous improvement of fuel oil standard in our country,denitrification and desulfurization of coal tar has become a research hotspot.In this paper,the properties of coal tar and the hydrogenation process of coal tar are introduced,the research status of catalysts for hydrogenation of coal tar is reviewed,and the research direction of catalysts for hydrogenation of coal tar is prospected.It is pointed out that the development of new green-friendly hydrogenation catalyst is the key to realize the coal tar hydrogenation technology.

A series of Mo-Bi catalysts were prepared by a microwave-assisted hydrothermal method for the oxidation reaction of isobutene (IB) to methacrolein (MAL).The catalysts were characterized by XRD,Raman,SEM and H₂-TPR methods to determine Co₆Fe₄Mo₁₂Bi_1.5O_x,CoMoO₄,MoO₃ and FeMoO₄ crystalline phases.The researches focus on the effects of preparation time and temperature on catalysis performance.Results showed that the catalyst particle morphology and composition were greatly affected by the preparation time.With the extension of preparation time,the agglomeration of catalyst particles was intensified,and the nanoparticles were transformed into micron rod-like particles,and more Co₆Fe₄Mo₁₂Bi_1.5O_x was generated at the same time.In addition,the preparation temperature of 160 ℃ was the most favorable for the formation of active phase.At the temperature,the catalysts prepared for 90 min and 120 min showed good catalytic performance,and the conversion of IB and the selectivity of MAL were both more than 90%.

Copper metal organic framework material (Cu-MOF) was synthesized by steam induction method,and cerium was introduced into the Cu-MOF skeleton structure by impregnation method to obtain composite precursor.Then,a new type of Cu-based composite oxide was prepared by high-temperature heat treatment.It was found that the doping of cerium could modify the crystal structure of Cu-based composites.As well-prepared catalysts,the effect of cerium loading was investigated on the catalytic performance of Cu-Ce composite oxides,and to obtain the optimal preparation conditions of the catalyst.The optimized composite catalyst exhibited efficient catalytic oxidation activity for CO under 180 ℃ conditions,with a space velocity of 50 000 h^-1 and CO removal efficiency of over 99%.In addition,the addition of TiO₂ in the synthesis of Cu-MOF could modulate the formation of CuO and promote the catalytic performance of the catalyst for CO oxidation.

5%TiO₂-nMoO₃ catalysts with different amounts of MoO₃ were prepared by molten salt roasting and impregnation.The hydrodesulfurization activity of the catalysts was evaluated by using dibenzothiophene/cyclohexane solution as model reactant in a self-made high pressure micro reactor.XRD,BET,H₂-TPR and NH₃-TPD were used to characterize the phase structure,specific surface area,reduction performance and surface acidity of the catalysts.The results showed that when the reaction pressure was 4.0 MPa,liquid hourly space velocity was 10 h^-1,and the volume ratio of hydrogen to oil was 600∶1,the hydrodesulfurization activity increased firstly and then decreased with increasing of MoO₃amount.When the amount of MoO₃ was 15%,the maximum hydrodesulfurization conversion of dibenzothiophene could reach 30.08%,95.35% and 97.42% at 280 ℃,300 ℃ and 320 ℃.The desulfurization of dibenzothiophene over 5%TiO₂-nMoO₃ catalyst was mainly carried out by direct desulfurization.

BiOBr nanosheets and BiOBr microspheres were prepared by hydrothermal method using sodium hydroxide and cetyltrimethyl ammonium bromide as morphology guides.The CdS nanoparticles were loaded on the BiOBr surface by the hydrothermal deposition method.The morphology,structure,and band structure of the catalyst samples were characterized by SEM,XRD,and UV vis DRS,respectively.The activity of the samples was evaluated by the photocatalytic reduction of CO₂ in cyclohexanol under visible light.The results show that the main products are cyclohexanone (CH) and cyclohexyl formate (CF).The activity of the hierarchical microsphere CdS/BiOBr composites is higher than that of the nanosheet structure composites.After four repeats,the activity of the catalyst did not decrease significantly.This study provides a new idea for the design of catalysts and reaction systems for efficient conversion of CO₂.

A series of solid catalysts (HPWx/SMH-SiO₂) with different HPW amounts were prepared by incipient impregnation method using submicron hollow silicon dioxide (SMH-SiO₂) prepared by hard template method as support and phosphotungstic acid (HPW) as active component.The catalysts were systematically analyzed by infrared spectroscopy,ultraviolet spectrophotometry,X-ray diffraction,scanning electron microscopy,transmission electron microscopy and energy spectrum elements.The results show that HPW is successfully loaded into the hollow structure of SMH-SiO₂,and HPW/SMH-SiO₂ structure is complete with high thermal stability,chemical stability,catalytic activity in one-step synthesis adipic acid from hydrogen peroxide oxidation with cyclohexene.The catalyst is easy to be separated and recycled.

The performance of ruthenium catalysts supported by different carriers based on impregnation method in liquid hydrogenation of 4,4’-diaminodicyclohexyl methane to trans-trans isomeric PACM was investigated,and the influence of the second metal additive on the performance of catalysts was studied. The results showed that the activity and selectivity of catalysts were significantly improved after the addition of metal Re,and the optimal loading ratio of Ru∶Re is 5∶1.The content of PACM trans-trans isomer is less than 20%. The catalyst has good stability.

A primary hydrothermal method was used to adjust the thickness of Bi₂O₂CO₃ nanosheets by adjusting the solvent,and construct hydrangea-like Bi₂O₂CO₃ with different specific surface areas,functional group grafting and oxygen vacancies to improve the separation efficiency of photoexcited charge carriers.The structures and topography were characterized by XRD,SEM,TEM and XPS.The photocatalytic properties of catalysts in tetracycline hydrochloride solution (TC),methyl orange solution (MO) and bisphenol A solution (BPA) were studied by adsorption and degradation experiments.The results showed that the adsorption efficiency of MO,TC and BPA of the modified Bi₂O₂CO₃ with ultra-thin structure(BiC-G) reached 81.1%,60.5% and 25.4% within 10 minutes,which were 2.32,5.5 and 3.18 times of the unmodified samples(BiC-W).After irradiation,the degradation efficiency was 86.3%,82.6% and 49.9%,which were 2.12,4.86 and 1.96 times of BiC-W.The above experimental results show that the modified catalyst provides more adsorption sites due to the grafting of functional groups and the generation of oxygen vacancies,which is the main reason for the improvement of photocatalytic performance.

CuBi₂O₄ is a novel semiconductor material with the advantages of narrow band gap,high visible light absorption capacity and low cost.This paper systematically outlined the preparation strategy and optimized performance studies of CuBi₂O₄ with different morphological structures (1D,2D and 3D),and further outlines the applications of modified CuBi₂O₄ in degradation of antibiotics,degradation of dyes,CO₂ reduction and hydrogen production by photolysis of water.Finally,the outlook of future research directions of CuBi₂O₄ is presented.