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Surface pits stabilized au catalyst for low-temperature CO oxidation

Rare Metals 2022年第9期41卷 3060-3068页

作者： Ya-Feng Cai Chen Fei Cheng Zhang Jie Yang Li Wang Wang-Cheng Zhan Yang-Long Guo Xiao-Ming Cao Xue-Qing Gong Yun Guo Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

Development of active and stable catalysts for low-temperature CO oxidation has long been regarded as a hot *** this contribution,we used CeO_(2) with high-density surface pits as support to prepare an active and stable au/CeO_(2) catalyst by an adsorption-deposition *** obtained 0.05 wt%au/CeO_(2)-TD(where TD represents thermal decomposition)can maintain its activity at 80℃ for more than 20 h or even after calcination at 800℃ for 2 *** characterization results showed that the high-density surface pits on CeO_(2)-TD play a decisive role in the stabilization of au and enhancement of the redox *** work may provide a new strategy to improve the stability of supported metal catalysts by a simple and conventional method.

关键词： au catalyst CeO_(2) Surface defect Stability CO oxidation

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Wheat flour-derived N-doped mesoporous carbon extrudes as an efficient support for au catalyst in acetylene hydrochlorination

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Chinese Journal of Catalysis 2018年第10期39卷 1664-1671页

作者： Jie Liu Guojun Lan Yiyang Qiu Xiaolong Wang Ying Li Institute of Industrial Catalysis Zhejiang University of TechnologyHangzhou 310032ZhejiangChina

We recently reported an N‐doped mesoporous carbon(N‐MC)extrudate,with major quaternary N species,prepared by a cheap and convenient method through direct carbonization of wheat flour with silica,which has excellent catalytic performance in acetylene ***,we examined the activity of au supported on N‐MC(au/N‐MC)and compared it with that of au supported on nitrogen‐free mesoporous carbon(au/MC).The acetylene conversion of au/N‐MC was 50%at 180°C with an acetylene space velocity of 600 h–1 and VHCl/VC2H2 of 1.1,which was double the activity of au/MC(25%).The introduced nitrogen atoms acted as anchor sites that stabilized the au3+species and inhibited the reduction of au3+to au0 during the preparation of au/N‐MC catalysts.

关键词： au catalyst Mercury free catalyst Acetylene hydrochlorination N doped mesoporous carbon

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Effect of Fe metal on the growth of silicon oxide nanowires

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 317-321页

作者： Wei-long Liu Shu-huei Hsieh Ching He Chen Wen-jauh Chen Department of Materials Science and Engineering Formosa University Yunlin 632 China Taipei Department of Materials Engineering Pingtung University of Science and Technology Pingtung 912 China Taipei Graduate School of Materials Science Yunlin University of Science and Technology Yunlin 632 China Taipei

Silicon oxide （SiOx） nanowires are generally grown on Si substrate under the catalysis of au in N2 atmosphere at elevated temperatures. Because the price of au metal is quite high, Fe metal is then used to replace a part of au for catalyzing the growth of SiOx nanowires. The results show that the Fe film can be used as the diffusion barrier of au. SiOx nanowires are grown on au/Fe/Si substrate at 1030℃. Under the catalysis of Fe/au, the efficiency for the growth of SiOx nanowires is promoted.

关键词： silicon oxide nanowires au catalyst Fe substitution Si substrate

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Recent Advances of the Combination of au/Acid Catalysis

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Chinese Journal of Chemistry 2014年第10期32卷 937-956页

作者： Shuo Zhang Fang Wei Chuangling Song Jiong Jia Zhenghu Xu Key Lab for Colloid and Interface Chemistry of Education Ministry School of Chemistry and Chemical EngineeringShandong UniversityJinanShandong 250100China

Recently,homogeneous gold catalysis has attracted tremendous attention and has also been widely used in multistep *** current reaction methodology starts from the gold activation of unsaturated carbon bond and subsequent nucleophilic *** combination of a gold catalyst with another acid catalyst,including Brønsted acid and Lewis acid,is possible to bring two distinctive catalytic systems together and deliver unprecedented new *** essentially,it avoids the purification of unstable intermediates and improves the step and atom ***,the recent progress in the au/Acid combined catalysis is reviewed,including the scope of reactions,mechanism and synthetic applications.

关键词： au catalyst Brønsted acid Lewis acid relay catalysis Tandem reaction

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