期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 321, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.122083
关键词
CO2 hydrogenation; Reversewater-gas shift; Gold; Operando spectroscopy; Oxygen vacancy
Gold-based catalysts with low gold loading supported on TiO2 and ZrO2 were synthesized and characterized. The Au/TiO2 catalyst showed higher activity than Au/ZrO2 at 250℃, with different reaction mechanisms involved.
Gold-based catalysts have shown high catalytic activity for reverse water gas shift (RWGS) reactions at low temperatures. Despite extensive studies, the RWGS reaction on Au-based catalysts with very low Au content (< 0.1 wt%) has not yet been investigated. In this study, TiO2 and ZrO2 supported gold catalysts with such low gold loading have been synthesized and tested for RWGS. The catalysts were investigated by a series of in/ex-situ characterization techniques, including ICP-OES, XRD, BET, XPS, STEM, STEM-EELS, TAP, in-situ DRIFTS and in -situ EPR. At 250 oC, the Au/TiO2 catalyst showed almost 10 times higher activity than Au/ZrO2. In-situ DRIFTS results suggest that the formate mechanism is the predominant mechanism over Au/ZrO2, while over Au/TiO2 the reaction proceeds via the formation of hydroxycarbonyl intermediates. A combined study including STEM, STEM-EELS, XPS, and in-situ EPR suggests that the interfacial Au-Ov-Ti3+ sites are responsible for the superior activity of Au/TiO2.
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