甲烷化
钴
催化作用
X射线光电子能谱
反应性(心理学)
部分氧化
分压
化学
化学工程
无机化学
材料科学
有机化学
氧气
工程类
病理
医学
替代医学
作者
Job J.C. Struijs,Valery Muravev,Marcel A. Verheijen,Emiel J. M. Hensen,Nikolay Kosinov
标识
DOI:10.1002/anie.202214864
摘要
The direct catalytic conversion of atmospheric CO2 to valuable chemicals is a promising solution to avert negative consequences of rising CO2 concentration. However, heterogeneous catalysts efficient at low partial pressures of CO2 still need to be developed. Here, we explore Co/CeO2 as a catalyst for the methanation of diluted CO2 streams. This material displays an excellent performance at reaction temperatures as low as 175 °C and CO2 partial pressures as low as 0.4 mbar (the atmospheric CO2 concentration). To gain mechanistic understanding of this unusual activity, we employed in situ X-ray photoelectron spectroscopy and operando infrared spectroscopy. The higher surface concentration and reactivity of formates and carbonyls-key reaction intermediates-explain the superior activity of Co/CeO2 as compared to a conventional Co/SiO2 catalyst. This work emphasizes the catalytic role of the cobalt-ceria interface and will aid in developing more efficient CO2 hydrogenation catalysts.
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