文献类型：期刊文献

英文题名：Insights into the role of Mo in boosting CHx* oxidation for CO2 methane reforming

作者：Lu, Jiali Shi, Yongyong He, Xiong Zhou, Qiao Li, Ziwei Liu, Fei Li, Min

第一作者：Lu, Jiali

机构：[1] Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China; [2] School of Civil Engineering, Guizhou Institute of Technology, Guiyang, 550025, China

第一机构：Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China

通信机构：Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China;Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China;Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China

年份：2024

卷号：231

外文期刊名：Renewable Energy

收录：EI(收录号：20242816659597);Scopus(收录号：2-s2.0-85197658631)

语种：英文

外文关键词：Binary alloys - Carbon - Catalysts - Deposition - Dissociation - Fourier transform infrared spectroscopy - Methane - Molybdenum alloys - Oxidation - Shells (structures) - Silica - Silicon

摘要：CHx* oxidation is one of the most vital routes to alleviate the carbon deposition problem of CO2 reforming of methane (DRM) reaction. Whereas, little experimental evidence has been observed on NiMo catalysts where the CHx* oxidation was dominant over its dissociation reaction. Herein, to experimentally unveil the CHx* oxidation route of NiMo catalysts, we design three catalysts with different particle sizes and structures. Among them, Mo/Niphy@SiO2 core shell catalyst demonstrated the dominant CHx* oxidation route over its dissociation based on in-situ diffuse reflectance infrared Fourier transform spectroscopy experiments. This was attributed to the confinement effect of SiO2 and the formation of Ni–Mo alloy, inhibiting the CHx* dissociation reaction. It exhibited relatively stable CH4 and CO2 conversions (77 % and 75 % respectively) within 180 h. By contrast, on Mo/Niphy catalyst which has a big Ni size, CHx* was mainly dissociated to C* and oxidized to CO which further underwent a disproportion reaction to produce CO2 and C*, leading to the severe carbon deposition and unstable DRM performance. The strategy to unveil the dominant role of CHx* oxidation via design catalysts with different sizes and structures sheds light on the study of reaction mechanism of other reactions. ? 2024 Elsevier Ltd