催化作用
X射线光电子能谱
甲烷厌氧氧化
拉曼光谱
氢
甲烷
氧气
化学工程
材料科学
吸附
化学
无机化学
物理化学
有机化学
工程类
物理
光学
作者
Jaeha Lee,Tae‐Hwan Lim,Eunwon Lee,Do Heui Kim
出处
期刊:Chemcatchem
[Wiley]
日期:2021-06-26
卷期号:13 (16): 3706-3712
被引量:10
标识
DOI:10.1002/cctc.202100653
摘要
Abstract Methane is a useful chemical resource, but removing it, a powerful greenhouse gas, is important to prevent global warming. In this study, the methane oxidation activity of conventional Pd/CeO 2 catalyst was improved by enhancing the oxygen mobility of ceria surface via the simple defect engineering. Raman spectroscopy demonstrates that the defect concentration of ceria surface is reduced after high temperature treatments. Cryogenic hydrogen‐temperature‐programmed‐reduction curves indicate that the surface oxygen of ceria in Pd/CeO 2 catalysts with the reduced defect concentration became mobile, resulting in the facile reduction at the lower temperature. X‐ray diffraction, X‐ray photoelectron and X‐ray adsorption spectroscopies show that the improvement in the surface oxygen mobility does not originate from the change in PdO x particle size nor its oxidation state. As a result, the temperature of 50 % conversion of methane shifted by 25 °C to the lower temperature on Pd/CeO 2 catalyst with the reduced defect concentration. This work highlights that the catalytic activity can be enhanced by promoting the active participation of the surface oxygen of support.
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