文献类型：期刊文献

英文题名：Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene

作者：Wang, Hong-Kui[1];Yi, Chao-Yong[1];Tian, Li[2];Wang, Wen-Juan[1];Fang, Jian[1];Zhao, Ji-Hua[1];Shen, Wei-Guo[3]

机构：[1]Lanzhou Univ, Sch Chem & Chem Engn, Lanzhou 730000, Peoples R China;[2]Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China;[3]E China Univ Sci & Technol, Sch Chem & Chem Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：2012

外文期刊名：JOURNAL OF NANOMATERIALS

收录：;EI(收录号：20114714548336);WOS:【SCI-EXPANDED(收录号:WOS:000296819800001)】；

基金：The authors kindly thank Jianxi Liu, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, for assistance with the XPS measurements. Financial support was provided by the National Natural Science Foundation of China (Projects nos. 20603014, 20673059, and 20973061), the Chinese Ministry of Education (Key project 105074), the Committee of Science and Technology of Shanghai (Projects nos. 0652nm010 and 08JC1408100), and the Fundamental Research Funds for the Central Universities (Project lzujbky-2011-116).

语种：英文

外文关键词：Catalyst activity - Alumina - Microemulsions - Aluminum oxide - Nitrogen compounds - Nanoparticles - Binding energy - Calcination - Nanocatalysts - Copper alloys - Styrene

摘要：Ag/Cu bimetallic nanocatalysts supported on reticulate-like gamma-alumina were prepared by a microemulsion method using N2H4 center dot H2O as the reducing agent. The catalysts were activated by calcination followed with hydrogen reduction at 873K, and the properties were confirmed using various characterization techniques. Compared with metal oxides particles, Ag-Cu particles exhibited smaller sizes (<5 nm) after calcination in H-2 at 873K. XPS results indicated that the binding energies changed with the Ag/Cu ratios, suggesting that increasing the copper content gave both metals a greater tendency to lose electrons. Furthermore, Ag-Cu bimetallic nanoparticles supported on gamma-alumina showed better catalytic activity on the epoxidation of styrene as compared with the corresponding monometallic silver or copper. The styrene oxide selectivity could reach 76.6% at Ag/Cu molar ratio of 3/1, while the maximum conversion (up to 94.6%) appeared at Ag/Cu molar ratio of 1/1 because of the maximum interaction between silver and copper.