文献类型：期刊文献

英文题名：Support effect on the bimetallic structure of Ir-Re catalysts and their performances in glycerol hydrogenolysis

作者：Deng, Chenghao[1];Leng, Li[1];Duan, Xuezhi[1];Zhou, Jinghong[1];Zhou, Xinggui[1];Yuan, Weikang[1]

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

年份：2015

卷号：410

起止页码：81

外文期刊名：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录：;EI(收录号：20153901307668);WOS:【SCI-EXPANDED(收录号:WOS:000365368100011)】；

基金：This work was supported by the National Natural Science Foundation of China (21106047).

语种：英文

外文关键词：Hydrogenolysis; Glycerol; Ir-Re structure; Support effect; Mobility

摘要：Comparative study was made between the bimetallic Ir-Re catalyst supported on amorphous silica-alumina (ASA) and the ones supported on de-aluminated ASA (D-ASA) to elucidate the effects of surface Al in the support on the Ir-Re structure and their catalytic behavior in glycerol hydrogenolysis. The Ir-Re interaction is greatly inhibited because of the stronger interaction between Re species and (Si-)Al-OH sites on ASA surface, resulting in the appearance of highly dispersed Re clusters and large Ir crystals after reduction. The barely synergy between the isolated Ir and Re metals in addition to the decreased metal dispersion restrains the glycerol hydrogenolysis reaction over Ir-Re/ASA. On the other hand, the retained mobility of Re species on 'inert' D-ASA supports offers the intimate contact between Ir and Re species and hence the formation of Ir-Re alloy catalysts after reduction, promoting greatly the synergy between Ir and Re species in glycerol hydrogenolysis. (C) 2015 Elsevier B.V. All rights reserved.