As relatively cheap noble metal,Ag component with unique physicochemical properties plays important roles in the catalysis.It was found that Ag had excellent performance in hydrogenation reactions.The significant characteristic of Ag as the main composition of the catalysts is that it can control the extent of hydrogenation and realize selective hydrogenation for the reactions with reactant containing various hydrogenation active sites,or for the reactions from alkynes to alkenes.Besides,Ag as a promoter of the catalysts can improve hydrogenation selectivity,catalytic activity and stability of Pt,Au,Ni catalysts.In addition,Ag can reduce the reduction temperature of Cu,Ni catalysts,and even eliminate the pre-reduction step of the catalyst.Ag also can prevent the metals of catalysts from leaching into the solvents when the reactions contain acidity.The research progress of Ag-only catalysts and Ag-containing multimetallic catalysts in hydrogenation was reviewed in this paper,with the emphasis on the special functions of Ag as main component or promoter in the catalysts.

In recent years,the rapid increase emission of CO₂ into the atmosphere threatens human society and natural environment.In order to solve this problem,researchers put forward the carbon conversion technology to convert CO₂ into high value-added chemicals through catalysts.Metal-organic framework (MOF) is a kind of material with large specific surface area,highly ordered pore structure,diverse topology type and good stability.These properties of MOF make it have wide application prospects,including gas adsorption,storage and separation,sensing,drug delivery,fluorescence and catalysis.In this paper,MOF as a catalyst for CO₂ adsorption and conversion is reviewed,including flexible framework,Lewis active sites,controllable pore size and defect structure.

The immobilized titanium dioxide has many advantages,such as easy recycling and improving photocatalytic activity.The immobilization methods of titanium dioxide such as sol-gel method,chemical vapor deposition,electrodeposition and bonding method were mainly introduced.Various kinds of titanium dioxide carriers such as glass,plastic,metal,natural mineral,adsorbent and ceramic were also discussed.

The research progress of noble metal mercury-free catalysts for acetylene hydrogenation in recent years is reviewed.The active components,supports and their effects on catalytic activity are discussed.The reasons for catalyst deactivation and regeneration are briefly introduced.The synergistic catalysis of various precious metals,the diversification of the carrier treatment methods,and the optimization of the conditions of the preparation process are prospects for the future development of the noble metal mercury-free catalytic reaction system.

Microfibrous structured Pd/AlOOH/Al-foam catalysts to be used for catalytic combustion of low concentration methane were developed with the aid of a facile hydrothermal surface oxidation of thin-sheet Al-foam followed by solvent-assisted incipient wetness impregnation of Pd nanoparticles (NPs).During the optimization of preparation conditions,we found that the performance of Pd/AlOOH/Al-foam depends on the surface morphology of AlOOH nanoarrays,phase composition of the nanoarrays support,and calcination temperature.Particularly,the hydroxyl-rich surface of AlOOH is inclined to induce well-dispersed Pd NPs and strong Pd-support interaction over the Pd/AlOOH-100 catalyst,thereby offering high low-temp-erature activity for methane combustion.Methane conversion declined rapidly at the early stage of the stability test,which was attributed to the sintering of Pd NPs resulted from the instability of surface alumina nanoarrays and Pd NPs.

Ordered mesoporous alumina has the characteristic of large surface area,uniform and narrow pore distribution,which has very important application value in the processes of multi-phase catalytic reactions and adsorption separations.Therefore,it is significant to study its synthesis and application.In this paper,the ordered mesoporous alumina were prepared by the sol-gel method from some cheap inorganic aluminum salts and the specific template agents.The pore structure and property could be adjusted by changing the type of template agents,aging time and temperature and other important factors.To detect the influencing factors during the preparation on the ordered mesoporous alumina,a series of testing techniques were used to characterize the structures and properties of the alumina.The results show that the mesoporous alumina has specific surface area of 324.80 m²·g^-1,pore volume of 0.62 cm³·g^-1,and average pore diameter of 6.07 nm when di-n-propylamine is used as template and it is aged at 40 ℃ for 48 h during the preparation.Meanwhile,the pore size distribution is narrow and the pores are well ordered.

Methanol synthesis catalysts were prepared by two-step coprecipitation method under pH value of 7.0,precipitation temperature of 70 ℃,80 ℃,90 ℃ and pH value of 8.0,precipitation temperature of 70 ℃.The effect of precipitation temperature and pH value on catalytic performance of methanol synthesis catalysts was investigated.The structure and properties of the catalysts were characterized by X-ray diffraction,N₂ adsorption-desorption,thermogravimetry and H₂-temperature-programmed reduction.The results indicated that when the precipitation pH value was 7.0,lower precipitation temperature was conductive to Zn²⁺ substitution in the precursor and the formation of Zn-Al hydrotalcite precursor in the first step,which were beneficial to catalytic activity.It was also found that lower precipitation pH value tended to higher temperature stability of the catalyst.

In this paper,a kind of guide agent with short aging time and high efficiency was studied,and NaY zeolite was prepared by hydrothermal synthesis from existing industrial raw materials under high temperature and certain pressure.The results show that the aging time has a significant effect on the effectiveness of the directing agent,and the optimum aging time is (16-24) h.The relative crystallinity of NaY molecular sieve can reach 91% under the condition of (110-115) ℃ crystallization temperature.

The hydrorefining catalyst of hydrocracking unit in a refinery was collected and characterized by X-ray diffraction,X-ray fluorescence spectrum,sulfur-carbon analysis,thermogravimetric analysis,N₂ adsorption-desorption and scanning electron microscopy.The results showed that a large amount of Si,P,Fe,Ca and As elements deposited on the outer surface of catalyst causing the deactivation of hydrorefining catalyst.Those sediments cover the active center and block the pore channel of catalyst,resulting in the specific surface area and pore volume of the catalyst decreased significantly.The catalyst activity cannot be recovered by regeneration process,which belongs to permanent inactivation.During operation,impurities in crude oil should be avoided to deposit on the main catalyst so as to reduce the influence of impurities in raw oil on the performance of catalyst.

In this paper,Co-Mo/TiO₂-Al₂O₃catalyst was synthesized to catalyze hydrofining of waste lubricating oil.Under reaction temperature of 340 ℃,reaction pressure of 7.0 MPa,space velocity of 1.2 h^-1,and hydrogen to oil volume ratio of 600∶1,the viscosity index of hydrofining oil improved by 21,S content 14.1 μg·g^-1,N content 8.0 μg·g^-1,Cl<0.1 μg·g^-1,chrominance 0.4,yield was 96.5%.

Product distributions of ACE and FFB device under different reaction conditions were compared using Daqing vacuum wax oil as feedstock.The results showed that the products distribution of cracking reaction of ACE device and FFB device had the similar rules with similar reaction conditions,but they had their own characteristics.For product distribution,the reaction conversion of the FFB device were higher than that of the ACE device,as well as higher gas and coke yield and low gasoline yield.For gasoline hydrocarbon composition,the contents of isoparaffin in gasoline in the FFB unit were higher,and the olefin contents were lower.The possible reason for the difference in product distribution and gasoline property was the difference in fluidization states and reaction atmosphere in the reactor.

It is very important for the normal operation of energy recovery system to detect and analyze the concentration and particle size of particles in FCC regeneration flue gas.According to the site conditions of high temperature and pressure of regenerated flue gas,the predictive flow rate method is a very suitable detection method.Through the detection of regenerated flue gas,it can make certain feedback and technical guidance for the operation of three rotary and flue gas turbine,so as to ensure the stable operation of the equipment.The dust content and particle size distribution in flue gas were measured,and the separation efficiency was calculated.The results showed that the total separation efficiency was 69.85% with the wet base concentration of 1 025 mg·Nm^-3,Dv(50)=29.713 μm in inlet and 309 mg·Nm^-3, Dv(50)=2.660 μm in outlet under standard conditions.

CnZnAl catalyst was prepared by co-precipitation method,and characterized by N₂ adsorption,TG-DTA,XRD and H₂-TPR.Reaction conditions and stability of catalyst were evaluated in a fixed-bed reactor.The results showed that the catalyst had mesoporous characteristics and high specific surface area,as well as a large pore diameter.After catalyst precursor was activated at 500 ℃,anionic groups decomposed completely and crystal was formed to possess good thermal stability.The main active components existed in the form of CuO and CuAl₂O₄ spinel,which were reduced to active phase Cu⁰ particles by H₂ at 250 ℃.Under optimized reaction conditions which were reaction temperature 180 ℃,reaction pressure 2.5 MPa and space velocity 0.5 h^-1,conversion of piperazine and selectivity to N-ethylpiperazine reached above 85% and 95%,respectively after 32 d of reaction.

Dalian Catalytic Engineering Technology Co.,Ltd. has studied the removal of sulfide from CO rich industrial tail gas,improved the original desulfurizer,and developed a one-step catalytic oxidation desulfurizer S-8419,which is used for the one-step removal of complex sulfide from CO rich industrial tail gas such as silicon manganese furnace tail gas and calcium carbide furnace tail gas.In the study,effects of sulfur concentration,space velocity,temperature and humidity on performance of desulfurizer were studied by simulating the composition of silicon manganese furnace tail gas as the feeding gas.The results show that the breakthrough sulfur capacity of S-8419 is 10.82% when the total sulfur volume fraction is 1×10^-3,the space velocity is 200 h^-1,the reaction temperature is 50 ℃,and the humidification temperature is 25 ℃.The desulfurization effects of S-8419 desulfurizer in the industrial side-stream experiment of silicon manganese furnace tail gas for three months also satisfy the purification index.

In the process industrialization,a large amount of greenhouse gas CO₂ is discharged into the atmosphere,and its impact on the atmospheric environment is getting more and more serious. However,CO₂ is also a cheap carbon source. Under the action of high-efficiency catalysts,CO₂ can be catalytically converted into high-added-value chemicals,which is of great significance for CO₂ emission reduction and resource utilization.This article reviews the latest researches in catalytic conversion of CO₂ and amine/H₂ (hydrosilane) to N-formamide and N-methylamine in terms of catalyst system,reaction technology and reaction mechanism,as well as the prospects.

Fe-based Fischer-Tropsch synthesis catalysts,featured by lower cost,lower selectivity to CH₄ and higher water-gas shift activity,have good prospects of application in high-temperature Fischer-Tropsch synthesis. This paper reviews latest researches in Fe-based Fischer-Tropsch catalysts mainly with respect to active crystal phase and its modification factors. Synthesis methods for Fe-based catalysts were outlined as well.

Application of microwave in oil sands,oil shale and petroleum processing was reviewed, including microwave-assisted oil sands separation,microwave-assisted oil sands or oil shale extraction,water/oil emulsion separation by microwave irradiation,removal of naphthenic acids by microwave irradiation,microwave-assisted hydrodesulfurization(HDS) and hydrodenitrogenation(HDN),microwave-assisted heavy oil cracking,and microwave-assisted heavy oil viscosity reduction,as well as the challenges and application prospects of microwave technology in the future.

Efficient treatment of high concentration organic wastewaters from energy and chemicals production for resource recovery becomes a tough task for wastewater treatment industry. Such wastewaters are featured by complicated chemical composition,high COD content,toughness in biodegradation and containing varieties of toxic substances. Their treatment processes are usually encountered by harsh hydrothermal reaction condition and catalyst stability problems. This paper reviews the challenges with existing treatment methods and discusses the future trends in wastewater treatment technologies for resource recovery.

Silica-recycling technology is used to recover silicon in the NaY silica-containing filtrate to prepare silica-alumina gel and recycle it to the NaY zeolitesynthesis process. Effects of storage time of silica containing filtrate,content of suspended solids,proportion of NaY zeolite synthesized by recycling silica-alumina gel and the storage time of silica-alumina gel on quality of as-prepared silica-alumina gel and quality of NaY zeolite synthesized by silica-alumina gel were investigated.The results showed that there is no p-type hybrid crystal in the filtrate while suspended solids in the filtrate,which promotes the growth of Y-type crystals,of (300-3 200) mg · L^-1 are stored at fixed temperature of 60 ℃ for no more than 11 hours. The suspended solids in the filtrate stored for (11-23) h begin to produce p-type hybrid crystals,which inhibits growth of Y-type crystals. Storage time of the filtrate has no significant effect on physicochemical properties of the prepared silicon aluminum gel.The growth rate of NaY crystal first accelerates and then slows down with increasing recycle ratio of silicon aluminum gel (20%-35%). Fastest growth rate of NaY crystal was attained at silicon aluminum gel recycle ratio of 27%. Qualified NaY molecular sieve can not be synthesized by silicon aluminum gel when it is stirred for (96-120) h.

The influence of feeding CGO at the first reactor and the second reactor separately on the overall product distribution of fluid catalytic cracking unit was investigated on a two-stage riser fluid catalytic cracking (TSRFCC) experimental unit,using vacuum gas oil (VGO) and vacuum residue (VR) mixed with coker gas oil (CGO) as the feedstock. Feeding CGO in different position of the first reactor was compared. The results showed that,when feeding CGO at the first reactor,the yield of light oil(gasoline+diesel) and total liquid recovery(LPG+gasoline+diesel) is higher than feeding CGO at the second reactor,which is obviously advantageous in improving the conversion,while feeding CGO at the second reactor produces more LPG. In addition,feeding solely CGO into the upper section of the first-stage riser inhibits coke formation and obtains better overall selectivity than feeding mixed feedstock.

In the fifth operating cycle of the 300M t/a RDS unit,Train I has been running for 348 days and Train Ⅱ for 393 days. At the end of the catalyst operation,pressure drops of Train I and Train Ⅱ reached 2.0 MPa and 2.04 MPa,respectively,the highest ever recorded and exceeding the design value. The unit was shut down as the result. This paper analyzes operation of the catalyst in the fifth operating cycle,including features of processed crude oil,catalyst loading,feed properties,main operating parameters and used catalyst.

K₂O-CuO-NiO/γ-Al₂O₃ carbonyl sulfur (COS) conversion and absorption dual-functional desulfurization catalyst was prepared and its performance in removing COS from liquid propylene under different conditions was investigated. Compared with traditional hydrolysis-desulfurization process,the catalyst can remove COS in olefins in one step,featuring by higher purification efficiency,larger sulfur capacity and simpler process.

A sulfonated magnetic titania nanotubes (TNTs-SO₃H/Fe₃O₄) was prepared by synthesis of titania nanotubes (TNTs) via hydrothermal method,followed by in-situ synthesis of magnetic titania nanotubes (TNTs/Fe₃O₄) using FeCl₂·4H₂O and diluted ammonia as the raw material,and finally modification by solfonation. Surface functional groups and thermal stability of the catalyst were characterized by FT-IR and TG. Catalytic behaviors of the TNTs-SO₃H/Fe₃O₄) for esterification of levulinic acid with n-butanol were studied. n-Butyl levulinate yield of 94.6% was obtained under the following condition: n(levulinic acid)∶n(n-butyl alcohol)=1∶4,dosage of catalyst=8%(based on mass of levulinic acid),118 ℃ for 6 h. TNTs-SO₃H/Fe₃O₄ exhibited strong acid sites and high stability even after using for five times and is promising as a potential commercial catalyst. The catalyst can be recovered by external magnetic field.

Larger volume expansion leads to material crushing and poor rate performance of red phosphorus,severely limiting its electrochemical performance in energy storage applications. The preparation of nano-sized red phosphorus is considered to be an effective treatment method to solve these problems. However,chemical synthesis to achieve the preparation of nano-sized red phosphorus has always been a huge challenge. Amorphous red phosphorus nanoparticles were prepared by dissolving and recomposing white phosphorus in isopropyl amine at room temperature to form a brown-red solution,followed by treating the solution in deionized water. Due to the nanometerization of the particles,the prepared amorphous red phosphorus exhibits excellent long-cycle stability and rate performance. Specific capacity of 760.3 mAh·g^-1 after 800 cycles under current density of 2 A·g^-1,and specific capacity of 1 208.7 mAh·g^-1 under 20 A·g^-1,was attained.

Dalian Catalytic Engineering Technology Co.,Ltd. developed a H-845 catalyst for removing impurity H₂ from CO₂ feed stream for urea synthesis. Effects of bed height diameter ratio,space velocity and pressure on behaviors of the hydrogen removal catalyst were investigated. 500-hour catalyst stability test results showed that the catalyst can effectively remove H₂ impurity in CO₂ to level qualifying for urea synthesis.

TiO₂/MoS₂ composite photocatalysts were prepared by sol-gel and hydrothermal synthesis method,using TBOT as titanium source and MoS₂ as carrier.Composition,morphology and structure of the catalysts were characterized using FT-IR,XRD,DRS,SEM,EDS and N₂ adsorption-desorption. Their photocatalytic activity was tested by degradation of methyl orange (MO) pollutant. Loadings,dosage of composite catalyst and pH were optimized. TiO₂/MoS₂exhibited high stability and activity,with degradation of 97.53% attainable for 50 mL 5 mg·L^-1 MO by 0.50 g of the composite catalyst at room temperature. Degradation of MO by TiO₂/MoS₂obeys first-order L-H kinetic model.

Rapid synthesis method was used to prepare micron-sized SSZ-13 with regular morphology and high crystallinity by introducing accelerator at 160 ℃ for 7 hours. The performance of copper based zeolite catalysts before and after high temperature hydrothermal aging,sulfur aging and hydrocarbon aging were systematically investigated. The results showed that hydrothermal crystallization for (6-7) h was the key period for rapid synthesis of SSZ-13. The NO_X ignition temperature of Cu/SSZ-13-f was 145 ℃,and the temperature window was (180-550) ℃. Driven by high-temperature water vapor environment,copper species were forced to leave the molecular sieve,migrate and aggregate to grow into copper oxide clusters,resulting in obvious deterioration of its high-temperature performance. Sulfate/sulfite formed by SO₂ poisoning was decomposed by heating. After reaching the temperature window (250-325) ℃,catalytic activity of Cu/SSZ-13-s gradually approached that of fresh sample after 450 ℃. The catalyst was less affected by hydrocarbons. No significant deterioration in catalytic activity was observed for Cu/ssz-13-hc[T₅₀=155 ℃ and T₉₀=(165-525) ℃]. Engine bench test results showed that NOx emissions of the as -prepared SCR sample under WHSC and WHTC cycle were 0.19 g·(kW·h)^-1 and 0.23 g·(kW·h)^-1 respectively,meeting the limitation requirements of GB 17691-2018.

Alkylation reaction is a major organic synthetic reaction.By introducing alkylating agent into C,N,O atoms of aromatic compounds,intermediates for various industrial products are obtainable.The key to alkylation reactionprocess is a high efficiencyand environmentally-benigncatalyst. In recent years,as solid acid-base bifunctional catalysts,hydrotalcites have attracted much attention due to simplicity in preparation,excellent catalytic performance and easy recovery and separation.In this paper,latest researches in the catalytic performance and reaction mechanism of C-alkylation,N-alkylation and O-alkylation of aromatic compounds over acid-base bifunctional hydrotalcite catalysts are reviewed and the prospects are outlined.

Production of chemicals from direct cracking of crude oil is the trends of the petrochemical industry, and molecular sieve catalysts play an important role in this process. Molding is an important step in preparation of commercial zeolite catalysts, being closely related to properties of the catalysts, such as mechanical strength, fluidization property, particle size distribution. This article reviews the influence of key factors, including type and content of molding additives, spray drying condition, on physicochemical properties of the catalysts. The trends in spray drying of molecular sieve were also outlined.

TiO₂/CeO₂ composite photocatalysts were prepared by sol-gel method and identified by XRD and TEM. Compared with pure TiO₂, TiO₂/CeO₂ composite photocatalysts transit its absorbance towards visible light and show better response to light. Catalytic performance of the as-prepared photocatalysts in photocatalysis and photocatalytic coupling Fenton oxidation was studied during guar solution simulated oilfield fracturing flowback fluid. The results show that the best catalytic activity of the composite photocatalyst was obtained under cerium oxide mass fraction of 10.19% (TiO₂/CeO₂-10.19%). In the coupling reaction, the degradation efficiency of TiO₂/CeO₂-10.19% in 4 h is much higher than that of pure TiO₂. Steady-state fluorescence test shows that the fluorescence intensity declines after introducing CeO₂, which can be attributed to that the heterojunction between TiO₂ and CeO₂ reducing the recombination efficiency of photogenerated carriers. Radicals scavenging test results show that ·OH is the main active species for photocatalysis and the coupling degradation reaction.

CuSAPO-34 molecular sieve exhibits high deNOx activity and high-temperature stability in ammonia selective catalytic reduction(SCR) of nitrogen oxides, but with inferior low-temperature hydrothermal stability. MCuSAPO-34 bimetallic molecular sieve was synthesized by in-situ one-step method, using Ce, Fe and Ni as the second metals, respectively. The structure and activity of the catalysts was characterized by XRD, BET, TPD, TPR and micro-reactor. The results indicated that, compared with CuSAPO-34, bimetallic molecular sieves have slightly lower crystallinity and higher surface area; and the change in acidity is closely related to sort of the metals. CeCuSAPO-34 exhibited the highest acidity, most number of active copper ions, highest deNOx activity and highest low temperature hydrothermal stability, enhancing water-containing flue gas deNOx efficiency from 82% to 88% at 150 ℃.

CuO-ZnO-Al₂O₃ methanol synthesis catalysts containing MgO, Ga₂O₃, ZrO₂ or CeO₂ as the promoters were prepared respectively by co-precipitation method. Effects of the promoters on catalytic performance of methanol synthesis catalysts were investigated. The structure and properties of the catalysts were characterized by XRD, TPR, SEM, TG-DTG and N₂-physisorption. The results indicated that addition of ZrO₂ increased surface area, promoted dispersion of the active components, and enhanced interaction between Cu and ZnO. The catalyst promoted by ZrO₂ showed the best catalytic activity and heat resistance among the catalysts. Methanol space time yield was 1.54 g·(h·mL)^-1 for fresh catalysts, and 1.42 g·(h·mL)^-1 after aging under a specific condition (T=235 ℃,GHSV=10 000 h^-1,P=5 MPa and $V_{H_{2}}$:V_C=4.0).

Hydrogenation of 4-methylpyridine to 4-methylpiperidine, a hydrogenation reaction of nitrogen-containing heterocyclic double bonds, was studied over Ru-Pt/C catalyst.Ru-Pt/C catalyst was prepared by impregnation methodand characterized and analyzed. Behaviors of the Ru-Pt/C catalyst for hydrogenation of 4-methylpyridine was investigated. Optimal behaviors for 4-methylpyridine hydrogenation was attained under Ru-Pt ratio of 3:2, reaction pressure of 2.5 MPa, reaction temperature of 90 ℃ and feed ratio of 0.5%.

PEC-251, a single-stage stage C₂ hydrogenation catalyst, was tested in a side-stream unit for loading proportion and long-term stability. The catalyst was then used in a 150 kt·a^-1 plant of PetroChinaJilin Petrochemical Company, with continuous operation in the first cycle for 14 months. Acetylene content at the outlet of the reactor was 0, lower than the upper limit of 2 μl·L^-1; average hydrogen/acetylene ratio was less than 1.8, lower than the conventional requirement of hydrogen/acetylene ≤3.0.

JFCP-01 multifunctional propylene promoter was prepared by mixing modified ZSM-5 molecular sieve, kaolin, γ-Al₂O₃ and aluminum sol in a certain proportion upon basis of preparation of ordered mesoporous active γ-Al₂O₃ from aluminum nitrate and ammonium carbonate followed by modification of ZSM-5 molecular sieve with phosphorus and lanthanum. JFCP-01 promoter was tested on an ACE test device and commercially applied to a FCC unit using MIP process. Propylene yield increased by 2.62%, slurry yield decreased by 1.11%, and coke yield decreased by 0.97% on the ACE test device, and propylene yield increased by 1.01% and slurry yield decreased by 0.89% on the FCC unit.

Hydrogenation of tail gas condensate in DCP production to cumene over Pd/SiO₂ catalyst was studied. The effects of the types of catalyst, temperature, LHSV and pressure on conversion of DMBA and AMS in the reaction were investigated. The results showed that the as-prepared Pd/SiO₂ catalysts had excellent conversion for hydrogenation of DMBA and AMS to cumene under inlet temperature of (150~160) ℃, reaction pressure of (1.8~2.2) MPa and LHSV of 4.8 h^-1, with DMBA conversion approaching to 100% and residual AMS of less than 0.03%. 1 200-hour test showed that the catalyst exhibited good stability, which is promising for industrial application.

H-mordenite and that modified by hydrothermal treatment, copper ion exchange and pyridine adsorption pretreatment was compared, and effects of different modification methods on reaction behavior of dimethyl ether carbonylation to methyl acetate investigated. The results showed that mordenite modified by copper ion exchange leads to change in acid sites on the surface, forming more active centers. Meanwhile, transformation of carbon deposition occurred and enhanced its carbonylation activity. Activity and stability for dimethyl ether carbonylation increased significantly after pyridine adsorption pretreatment. The mixture of HMOR and ZSM-35 exhibited good stability and long service life.

The catalytic performance of Ni&Cu/MOR for acetone hydrogenation in fixed bed reactor was investigated, including the influence of temperature, H₂/acetone molar ratio, LHSV and pressure. Acetone conversion of 99.92% and selectivity to isopropanol of 89.42% was attained under optimal condition as follows: reaction temperature 120 ℃,H₂/acetone molar ratio of 3,LHSV of (1-2) h^-1 and reaction pressure of (2-3) MPa.

Two-dimensional correlation spectroscopy and stoichiometry is used to detect low-concentration ephedrine and pseudoephedrine in weight loss drugs, which are detrimental to human health. The results showed that, compared with one-dimensional infrared spectroscopy, combination of two-dimensional correlation spectroscopy and stoichiometry makes it easier to detect low concentration ephedrine and pseudoephedrine in drugs. The characteristic peak information in low concentration mixed drugs that cannot be detected by one-dimensional infrared spectroscopy and original two-dimensional correlation spectroscopy, can be detected by two-dimensional correlation spectroscopy and stoichiometry. This method provides a new solution to rapid detection of drug components.

Based on the ceramic fiber filter developed by our company,the V -Ti catalyst was adopted and impregnated into the fiber filter to form a catalytic filter with function of dust removal and denitration.The effects of catalyst loading,filtration surface velocity and dust on denitrification performance and pressure drop were investigated.The results show that pressure drop increase NO_x conversion decrease and with the increase of catalyst loading and filtration surface velocity.The concentration and fall of the glass ash will cause the fluctuations of the flue gas, resulting in the variation of denitration efficiency between 96% and 99%.The pressure drop will increase with the extension of the time of adding glass ash.When catalyst loading is 9.01%,filtration surface velocity is 0.5 m·min^-1,the denitrification efficiency is more than 90% in the reaction temperature from 250 ℃ to 400 ℃,showing good prospect of industrial application.