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15 June 2025, Volume 33 Issue 6
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    Reviews & Prospects
  • ZHOU Yilong, SONG Peiyao, DAI Qiguang
    2025, 33(6): 1-18. DOI:10.3969/j.issn.1008-1143.2025.06.001
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    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 NOx,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.

  • BAI Jianming, WANG Junhua, HOU Pengfei, MAO Xuewei
    2025, 33(6): 19-25. DOI:10.3969/j.issn.1008-1143.2025.06.002
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    Hydrogen energy,as a clean and renewable secondary energy source,is an important way to achieve “carbon peak and carbon neutrality”.Proton exchange membrane (PEM) water electrolysis for hydrogen production is one of the promising technologies to realize “zero carbon” emissions because of its high efficiency,compact and pollution-free characteristics.However,the high cost of PEM electrolysis water hydrogen production system has severely limited its large-scale commercial application.In this paper,the routes of water electrolysis for hydrogen production and the basic principle of PEM water electrolysis technology are reviewed,and then the development barriers of the PEM water electrolysis technology are emphasized,including the barriers of critical materials—precious metal iridium catalyst and proton exchange membrane,the core devices—bipolar plate and porous transport layer.The reduction direction and development potential of PEM water electrolysis hydrogen production technology are discussed,and its application prospect is also prospected.

  • YANG Jiahua, XIN Yuxiang, SHI Ruimeng, WU Heng, YANG Lu, DUAN Qiuyu, SHI Huilong
    2025, 33(6): 26-34. DOI:10.3969/j.issn.1008-1143.2025.06.003
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    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.

  • CHEN Fengjiang
    2025, 33(6): 35-40. DOI:10.3969/j.issn.1008-1143.2025.06.004
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    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.

  • TIAN Du, ZHANG Yan
    2025, 33(6): 41-45. DOI:10.3969/j.issn.1008-1143.2025.06.005
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    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.

  • Catalyst Preparation & Research
  • SHI Sixuan, TIAN Xiaoming, MIN Tianle, HE Yaorong, JI Hongbing
    2025, 33(6): 46-52. DOI:10.3969/j.issn.1008-1143.2025.06.006
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    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.

  • ZHANG Long, ZHANG Guizhen, SONG Jianwei, WEI Gaixia, BAI Guangmei, QIU Wenge
    2025, 33(6): 53-62. DOI:10.3969/j.issn.1008-1143.2025.06.007
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    Suzuki cross-coupling reaction is a powerful route to construct C—C bond in fine-chemical synthesis.Developing a high efficient method to promote the performance of palladium-based catalyst in Suzuki coupling reaction is of great significance.In this article,a series of catalysts modified by 2,6-diaminopyridine(DAP),Pd(OH)2/FCN-D-X,are prepared successfully by pre adsorbing DAP molecule onto the surface of the flower-like carbon nanosheets(FCN) through physical adsorption and then loading the Pd active component.It was found that the activities and stabilities of Pd(OH)2/FCN-D-X in Suzuki coupling reaction are higher than that of the unmodified one,Pd(OH)2/FCN.The characterization results of X-ray diffraction (XRD),scanning transmission electron microscopy (STEM) and X-ray photoelectron spectroscopy (XPS) showed that the existence of DAP within the catalyst enhanced the dispersion of Pd species and improved the distribution of valence states of Pd leading to high performance of Pd(OH)2/FCN-D-X catalysts.

  • LI Guobin, CHENG Jie, WAN Kerou, LIN Tao, GAO Mingmimg, ZHENG Jinxin, CHAO Zhe, BAI Xuedong
    2025, 33(6): 63-68. DOI:10.3969/j.issn.1008-1143.2025.06.008
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    Co-Ti/Hβ zeolite was prepared by ion exchange method,and characterized by X-ray diffraction,N2 adsorption and desorption,FT-IR and NH3-TPD.The activity and regenerability of the catalyst prepared in this paper were systematically evaluated by applying oxygen as the oxidant in the reaction of epoxidation of styrene to ethylene oxide.The results showed that most of the supported Ti and Co metals were scattered on the surface of the zeolite,and the skeleton structure of the β zeolite was not damaged,and the modification of Co and Ti could effectively reduce the acid content of the zeolite.When the loading of cobalt and titanium reached 3%,the conversion rate of styrene reached 92.1% and the selectivity of ethylene oxide reached 83.2%.When using 3%Co-3%Ti/Hβ catalyst,the most optimal reaction temperature was 90 ℃,the most optimal reaction time was 4 h,and the most optimal oxygen flow rate was 30 mL·min-1.After repeated evaluation of the catalyst five times under optimal condition,the catalyst could still maintained good activity,and the conversion rate and selectivity could reached 90.1% and 82.3% respectively.

  • ZHANG Kexian, REN Li, ZHOU Jufa, CAI Hongcheng, DING Mingyue, YAO Pei, ZHAO Anmin
    2025, 33(6): 69-74. DOI:10.3969/j.issn.1008-1143.2025.06.009
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    Cu-Zn-Al-Mg methanol synthesis catalyst was prepared by co-precipitation method.The effect of calcination temperatures on its selectivity and activity were investigated and the catalysts were characterized by XRD,N2 low-temperature adsorption,TG-DTG and H2-TPR.The results showed that the catalyst precursor was incomplete decomposition at 250 ℃; when the calcination temperature was (300~350) ℃,the catalyst had the appropriate size of copper oxide crystalline,the catalyst had good selectivity and the best CO conversion; when the calcination temperature was 450 ℃,the copper oxide crystalline size was too big,although the selectivity of catalyst was the best (the liquid phase ethanol content was the lowest),but the CO conversion of the catalyst was the worst.

  • DU Bo, CHEN Ben, ZHOU Jie, YU Yimin
    2025, 33(6): 75-82. DOI:10.3969/j.issn.1008-1143.2025.06.010
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    A series of catalysts for aromatic nitro hydrogenation were prepared by hot feed method under different conditions.The catalysts were characterized by XRD,N2 low temperature adsorption-desorption,H2-TPR,ICP-MS,H2-chemisorption and particle size distribution,and the catalytic hydrogenation performance of the catalyst for nitrobenzamide derivatives was investigated in a high pressure fixed bed reactor.The results showed that the optimized catalyst,which had large specific surfaces area and good metal dispersion,can be obtained with the temperature at 60 ℃ and pH value at 7.5.The nickel species in the catalyst owned excellent reducibility and good reaction performance.When the reaction temperature,the pressure,the liquid space-time velocity and the hydrogen/oil ratio were respectively controlled at 95 ℃,1 MPa,2.25 h-1 and 10,the reactants conversion rate was up to 100% and the selectivity was 99.9%.The catalyst under this preparation condition was successfully scaled up to hundreds of kilograms and demonstrated excellent activity during a long-term evaluation process of 1 000 h.This study aimed to provide some references and feasibility for the industrialization of aromatic nitro hydrogenation catalyst.

  • WU Kun, LI Wenjun
    2025, 33(6): 83-88. DOI:10.3969/j.issn.1008-1143.2025.06.011
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    In this study,a series of supported perovskite composite oxide nCuO/L a 1 - xAxMnO3 catalysts were prepared by co-precipitation impregnation method for the preferred oxidation of CO in hydrogen-rich gas.The effects of the doping amount of the substituted A-site element Sr2+ and the loading of the active component CuO on the performance of the nCuO/L a 1 - xAxMnO3 catalyst were systematically investigated.We also analyzed the impact of the structural performance of the catalyst on the catalytic activity by means of XRD,BET,H2-TPR.The results showed that when the doping amount of Sr2+ was 0.3 and the loading of single-metal CuO was 1.0,the prepared 1.0CuO/La0.7Sr0.3MnO3 catalyst had the best CO priority oxidation activity.At the reaction temperature of 135 ℃,CO could be completely converted and the selectivity was 100%.

  • LIANG Qiong, WU Xinhua, ZHOU Xiang, WANG Xin, ZHOU Li
    2025, 33(6): 89-95. DOI:10.3969/j.issn.1008-1143.2025.06.012
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    A fully automatic calcination system based on a mesh belt kiln was designed to address the characteristics of strong fluidity,easy spillage,and easy breakage of solid spherical catalysts.The structure and operation process of fully automatic roasting system were introduced,and the industrial application of the 5A molecular sieve solid spherical catalyst was carried out.Industrial applications showed that when using a fully automated roasting system to produce 5A molecular sieve solid spherical catalysts,the yield increased by 42.0%,energy consumption decreased by 25.05%,yield increased by 5.41%,and the crushing and wear rates could be steadily controlled at a low level.After roasting,the product exhibited stable burn off,significantly increased the adsorption capacity of the target substance X,improved roasting uniformity,and significantly reduced the number of operating labor,achieved the goal of improving quality,reducing costs,and increasing efficiency.

  • Environmental Protection & Catalysis
  • BIAN Wen, WU Peng, LÜ Junjun
    2025, 33(6): 96-100. DOI:10.3969/j.issn.1008-1143.2025.06.013
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    The coal-to-ethylene glycol industry in China has developed rapidly,mainly adopting the oxalate ester synthesis process.However,the methyl nitrite (MN) and NOx emitted from the ethylene glycol tail gas unit of this process are harmful to health.The treatment of NOx in the tail gas of ethylene glycol produced by the synthesis of oxalate esters using H2 as the reducing agent through selective catalytic reduction (H2-SCR) was studied.Pt-based catalysts were prepared by impregnation method using CeO2,TiO2,Al2O3,SiO2,ZSM-5,ZnO,MoC and activated carbon as carriers respectively,and their denitrification performance under different temperatures,pressures and space velocities were investigated.The results showed that under the conditions of catalyst loading volume of 15 mL and a volume content of NO and CO in the feedstock gas of 8%,when the TMN-5 catalyst operates at reaction temperature of 220~260 ℃,pressure of 0.1~0.4 MPa,and space velocity of 300~1 000 h-1,the contents of NO,NOx,CO,and CH4 in the exhaust gas all meet the national emission standards.Moreover,the catalyst has good stability in 500 h long-term operation and at high temperature of 500 ℃.