期刊
CHEMISTRYSELECT
卷 6, 期 43, 页码 11900-11907出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202102823
关键词
Low-temperature water-gas shift reaction; nanotubes; oxygen vacancy; platinum; structure-activity relationships
资金
- Natural Science Foundation of Guangdong Province, China [2021 A1515010445]
- National Natural Science Foundation of China [51802305]
- Science and Technology Program of Guangzhou, China [202102020402]
- Analytical & Testing Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China
The study introduces CeO2 to modify TiO2 nanotubes, forming hybrid nanotubes to confine Pt nanoparticles as efficient catalysts for high WGS activity at low temperatures. The research finds a positive correlation between the redox ability of PtOx species and WGS activity, with Pt-O-v oxygen vacancies serving as important active sites for H2O dissociation and CO oxidation in the reaction.
Reducible oxides as supports have been demonstrated to improve the activity of Pt catalysts towards water-gas shift (WGS) reaction. The Pt species anchored by the oxygen vacancies derived from these supports play as catalytic sites during low-temperature WGS reaction. Herein, we introduced CeO2 to modify TiO2 nanotubes (TiO2NT) and prepared CeO2-TiO2 hybid-nanotubes ((CeO2)(x)(TiO2)(1-x)NT, x=0.2, 0.4, 0.6) to confine Pt nanoparticles (NPs) as the efficient catalysts for the low-temperature WGS reaction. Pt NPs confined in (CeO2)(x)(TiO2)(1-x)NT catalysts exhibit higher WGS activity than that of the Pt NPs entrapped in pure TiO2NT (Pt-in-TiO2NT) and Pt/CeO2 catalysts throughout the entire reaction temperature range. Activity measurements coupled with the physicochemical characterization of catalysts suggest that the redox ability of PtOx species is positive correlated with WGS activity and oxygen vacancy adjacent to Pt (Pt-O-v) serves as the active site for H2O dissociation and CO oxidation in WGS reaction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据