文献类型：期刊文献

英文题名：Plasma-assisted synthesis of Ag nanoparticles immobilized in mesoporous cellular foams and their catalytic properties for 4-nitrophenol reduction

作者：Gao, Jie[1,2];Xu, Jian[3];Wen, Shixian[1,2];Hu, Jun[1,2];Liu, Honglai[1,2]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[3]Shanghai Inst Measurement & Testing Technol, Shanghai 201203, Peoples R China

年份：2015

卷号：207

起止页码：149

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20150700515753);WOS:【SCI-EXPANDED(收录号:WOS:000350518600021)】；

基金：This work is supported by the National Basic Research Program of China (2013GB733501), the National Natural Science Foundation of China (Nos. 21176066, 21376074, 91334203), the 111 Project of Ministry of Education of China (No. B08021), the EU-IRSES of FP7-PEOPLE-2013-IRSES (PIRSES-GA-2013-612230) and the Fundamental Research Funds for the Central Universities of China.

语种：英文

外文关键词：Oxygen plasma; Ag nanoparticles; Catalytic activity; Reduction of 4-nitrophenol; MCF support

摘要：Silver nanoparticle is an important catalyst for many chemical reactions and usually demands complex synthesis technology. In this work, a convenient and efficient plasma-assisted synthesis method was proposed to synthesize a new type of composite catalyst with Ag nanoparticles immobilized in 3D mesoporous cellular foams (MCFs) of silica. The plasma treatment under O-2 atmosphere provided more activated silanol groups on the surface of MCF for the immobilization of Ag nanoparticles. The properties of immobilized Ag nanoparticles, such as smaller average size, higher loading, and better dispersion state greatly improved the reaction rate of the catalytic reduction of 4-nitrophenol (4-NP). Among them, with an average size of 6.0 nm and 2.6 wt% immobilized Ag nanoparticles, the catalyst MCF-100-Ag-0.01 showed the best catalytic activity for the reduction of 4-NP, that the apparent reduction rate constant was as large as 2.66 x 10(-2) s(-1), and the turnover frequency coefficient was as extremely high as 8.97 x 10(18) molecules g(-1) s(-1). The MCF-n-Ag-m composites could be expected as attractive catalysts for many other catalytic reactions. More importantly, this plasma-assisted synthesis approach could be a convenient way for the synthesis of highly active catalysts by immobilizing various types of metal nanoparticles in porous materials. (C) 2015 Elsevier Inc. All rights reserved.