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gold/Mg-Al mixed oxides catalysts for oxidative esterification of methacrolein:Effects of support size and composition on gold loading

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Chinese Journal of Chemical Engineering 2023年第12期64卷 128-138页

作者： Wangtao Li Qiancheng Zheng Huayu Zhang Yunsheng Dai Zhengbao Wang Key Laboratory of Biomass Chemical Engineering of Ministry of Education ERC of Membrane and Water Treatment(MOE)Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Yunnan Precious Metals Laboratory Co. LtdKunming 650106China

gold catalysts supported on Mg-Al mixed oxides for oxidative esterification of methacrolein are prepared by *** of the support particle size,concentration of HAuCl4 solution and Mg/Al ratio on gold loading and catalytic properties are *** catalysts are characterized by CO_(2)-TPD,EDS,XPS,STEM and XRD *** with smaller support particle size show more uniform gold distribution and higher gold dispersion,resulting in a higher catalytic performance,and the uniformity of gold and the activity of the catalysts with larger support particle size can be improved by decreasing the concentration of HAuCl4 *** Mg/Al molar ratio has significant effect on the uniformity of gold and the activity of the catalyst,and the optimum Mg/Al molar ratio is 0.1–*** study underlines the importance of engineering support particle size,concentration of HAuCl4 solution and density of adsorption sites for efficient gold loading on support by impregnation.

关键词： gold catalysts Oxidative esterification Support particle size effect Mass transfer Distributions Optimization

High thermal stable gold catalyst supported on La_2O_3 doped Fe_2O_3 for low-temperature CO oxidation

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Journal of Rare Earths 2010年第3期28卷 376-382页

作者：刘瑞辉张存满马建新 School of Environmental Science and Engineering Tongji University Clean Energy Automotive Engineering Center Tongji University School of Automotive Studies Tongji University

La2O3 doped Fe2O3 support was prepared by co-precipitation method,and gold was loaded by *** stability of gold catalyst was enhanced considerably by La2O3 *** when calcined at 500 oC for 12 h,the catalyst doped with La2O3 could convert 90% of CO at 28.9 oC,while the catalyst without La2O3 doping achieved 90% CO conversion at 43.5 *** techniques,such as N2 adsorption-desorption,X-ray diffraction(XRD),transmission electron microscopic(TEM) and thermogravime...

关键词： gold catalysts lanthanum Fe2O3 support sintering CO oxidation rare earths

PREPARATION OF Au/SULFONATED POLYSTYRENE catalysts FOR LOW-TEMPERATURE CO OXIDATION

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Chinese Journal of Polymer Science 2001年第5期19卷 503-507页

作者： Shi-hua Wu Xiu-cheng Zheng Wei-ping Huang Shou-min Zhang Wei Wei Department of Chemistry, Nankai University Tianjin 300071, China Department of Chemistry Nankai University Tianjin 300071 China

Supported Au catalysts for low-temperature CO oxidation were prepared by solvated metal atom impregnation (SMAI) and conventional impregnation (Cl). X-ray photoelectron spectroscopy (XPS) investigations indicated that the elemental gold in all the samples was in the metallic state, XRD measurements showed that the mean diameters of Au particles prepared by SMAI were smaller than those prepared by Cl with the same gold content. Catalytic tests showed that the SMAI catalyst had higher CO oxidation activity than the CI catalyst with the same compositions. Both SMAI and Cl catalysts exhibited high activity in low temperature CO oxidation. Full CO conversion was obtained at 323-383K.

关键词： CO oxidation gold catalysts solvated metal atom impregnations conventional impregnation sulfonated polystyrene

Synthesis of Subnanometer-Sized gold Clusters by a Simple Milling- Mediated Solid Reduction Method

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Chinese Journal of Chemistry 2018年第4期36卷 329-332页

作者： Qinggang Liu Xinkui Wang Yujing Ren Xiaofeng Yang Zhilian Wu Xiaoyan Liu Lin Li Shu Miao Yang Su Yanqin Li Changhai Liang Yanqiang Huang State Key Laboratory of Fine Chemicals School of Chemistry Dalian Uni- versity of Technology Dalian Liaoning 216024 China Dalian Institute of-Chemical Physics Collaborative Innovation Center ofChemistry for Energy Materials Chinese Academy of Sciences DalianLiaoning 116023 China

An effective solvent-free method based on a solid-reduction process was developed to fabricate ultrafine gold catalysts. By this method we revealed a strong size-dependent activity of Au species in which subnanometer-sized clusters exhibited the best activity in the hydrogenation of CO_2 to formate, with a turnover number of up to 9278 over 7 h at 90 ℃.

关键词： solid reduction subnanometer-sized clusters gold catalysts CO_2 hydrogenation

gold-containing metal nanoparticles for catalytic hydrogen generation from liquid chemical hydrides

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Chinese Journal of Catalysis 2016年第10期37卷 1594-1599页

作者：杨新春徐强日本国立产业技术综合研究所神户大学工学研究科

Liquid chemical hydrides, which store hydrogen in the form of chemical bonds, are considered one of the most promising classes of hydrogen storage materials. Their application depends heavily on the development of efficient catalytic systems. gold‐containing metal nanoparticles have exhibited excellent catalytic performance for hydrogen generation from liquid chemical hydrides. The present mini‐review focuses on recent developments in hydrogen generation from liquid chemical hydrides using gold‐nanoparticle and gold‐containing heterometallic nanoparticle catalysts.

关键词： gold catalysts Hydrogen generation Formic acid Ammonia borane Heterogeneous catalysis

Optimization and statistical analysis of Au-ZnO/Al_2O_3 catalyst for CO oxidation

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Journal of Energy Chemistry 2013年第3期22卷 498-505页

作者： Wenjin Yan Xinli Jia Tao Chen Yanhui Yang School of Chemical and Biomedical Engineering Nanyang Technological University Institute of Chemical & Engineering Sciences I Pesek RoadJurong IslandSingapore 627833 Department of Chemical and Process Engineering University of SurreyGuildford GU2 7XHUK

In our former work [Catal. Today 174 （2011） 127], 12 heterogeneous catalysts were screened for CO oxidation, and Au-ZnO/Al2O3 was chosen and optimized in terms of weight loadings of Au and ZnO. The present study follows on to consider the impact of process parameters （catalyst preparation and reaction conditions）, in conjunction with catalyst composition （weight loadings of Au and ZnO, and the total weight of the catalyst）, as the optimization of the process parameters simultaneously optimized the catalyst composition. The optimization target is the reactivity of this important reaction. These factors were first optimized using response surface methodology （RSM） with 25 experiments, to obtain the optimum： 100 mg of 1.0%Au-4.1%ZnO/Al2O3 catalyst with 220℃ calcination and 100℃ reduction. After optimization, the main effects and interactions of these five factors were studied using statistical sensitivity analysis （SA）. Certain observations from SA were verified by reaction mechanism, reactivity test and/or characterization techniques, while others need further investigation.

关键词： carbon monoxide oxidation data-based modeling design of experiments gold catalysts heterogeneous catalysis rapid optimization