文献类型：期刊文献

英文题名：Influence of ceria existence form on deactivation behavior of Cu-Ce/SBA-15 catalysts for methanol steam reforming

作者：Chen, Yue[1];Huang, Yongmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2023

卷号：48

期号：4

起止页码：1323

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20225313324058);WOS:【SCI-EXPANDED(收录号:WOS:000915040500001)】；

基金：Acknowledgements Yue Chen was responsible for conceptualization, methodol- ogy and writing. Yongmin Huang was in charge of project supervision and administration. Research Centre of Analysis and Test of ECUST provided analysis assistance. This work was supported by the Fundamental Research Funds for the Central Universities (No. 222201817001) .

语种：英文

外文关键词：Methanol steam reforming; Cu-based catalysts; Ceria; Deactivation; Size effect; Carbonaceous deposits

摘要：Methanol steam reforming (MSR) is promising in hydrogen production. Cu-SBA-15 and Cu -Ce/SBA-15-I suffer poor selectivity owing to sluggish steam activation on Cu0-SBA-15. And small Cu0 tend to sinter due to Ostwald ripening. Sintering can be avoided by modi-fying SBA-15 with Ce ion exchange, where Si-OH groups are replaced by Si-O-Ce. Ceria existence form varies from patches to small particles as exchange times increase. In Cu -Ce/SBA-15, ceria patches strongly interact with Cu, which promotes steam activation, hence the catalyst exhibit remarkable activity and selectivity. In Cu-3Ce/SBA-15, ceria patches grow into small ceria particles (<5 nm) after repeated ion exchange. Ceria particles tend to be over-reduced, thus accounting for carbonaceous deposits on excessive Ce3 thorn . Such deactivation is reversible, and catalytic performance can resume after air exposure. This study reveals that deactivation behavior of MSR catalysts can be modified by existence and size effect of ceria, which is worth referring to in further MSR catalyst synthesis.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.