文献类型：期刊文献

英文题名：Insight into active sites of Pd-Au/TiO2 catalysts in hydrogen peroxide synthesis directly from H2 and O2

作者：Ouyang, Like[1];Da, Guo-jin[1];Tian, Peng-fei[1];Chen, Tian-yuan[1];Liang, Guo-da[1];Xu, Jing[1];Han, Yi-Fan[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：311

起止页码：129

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20140117152153);WOS:【SCI-EXPANDED(收录号:WOS:000333489500015)】；

基金：The authors are grateful to the support from the Chinese Education Ministry 111 project (B08021), the National Science Foundation (21176071, 21106041, 21273070), the Program for New Century Excellent Talents in university (NCET-12-0852), Science and Technology Commission of Shanghai Municipality (11JC1402700), Innovation Program of Shanghai Municipal Education Commission (11ZZ52, 12ZZ051), Shanghai Natural Science Foundation (11ZR1408400), and Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Pd-Au nanoalloy; H2O2 synthesis; H2O2 hydrogenation; Active sites; Interface; Characterization

摘要：H2O2 synthesis directly from H-2 and O-2 and side reactions in this system over a variety of Pd-Au/TiO2 catalysts have been studied systemically. The effects of Pd/Au ratio on H2O2 synthesis and subsequent H2O2 hydrogenation were investigated. The catalysts were characterized using multiple techniques including transmission electron microscopy (TEM), in situ diffuse reflectance infrared Fourier transform spectroscopy of CO adsorption (CO-DRIFTS), X-rays photoelectron spectroscopy (XPS), and temperature-programmed desorption of H-2/O-2 (H-2-/O-2-TPD). By detailed analysis of these spectroscopies and the kinetics of this reaction, new insights into various active sites of Pd upon alloying with Au were elaborated. Pd monomer surrounded by Au atoms could be the primary active site for H2O2 formation. In addition, Pd ensembles were assumed to be more active for H2O2 hydrogenation than monomeric Pd sites; the over-oxidation of H-2 to H2O likely occurred at the interface between Au and TiO2. (C) 2013 Elsevier Inc. All rights reserved.