Synergistic metal-support interaction promoting the formation of oxygen vacancies and their role in CO-PROX over CuO/NiO-CeO2 catalyst

催化作用 非阻塞I/O 近程 氧气 X射线光电子能谱 无机化学 空间速度 三元运算 化学 摩尔比 吸附 金属 材料科学 化学工程 物理化学 一氧化碳 冶金 选择性 生物化学 有机化学 计算机科学 工程类 程序设计语言
作者
Dianqing Wu,Yaxin Jiang,Caishun Zhang,Jiao Han,Honghao Wang,Yajie Liu,Xiaoning Hou,Lei Zhang,Zhixian Gao
出处
期刊:Journal of environmental chemical engineering [Elsevier BV]
卷期号:12 (1): 111818-111818 被引量:2
标识
DOI:10.1016/j.jece.2023.111818
摘要

A series of x/yCuO/NiO-CeO2 catalysts with a constant Cu+Ni molar content and low copper loading of 1 wt% had been prepared by the step-by-step impregnation method and characterized by various techniques (XRD, N2-adsorption/desorption, HR-TEM, H2-TPR, Raman and XPS). CO preferential oxidation (CO-PROX) under H2/CO2-rich conditions had been performed. Experimental results indicated that the catalytic activity of CuO/CeO2 could be enhanced by substituting partial Cu with Ni, and with a Cu/Ni molar ratio of 1/2, the highest catalytic performance was observed. Under the conditions of temperature 130 ℃, space velocity 20266 mL·gcat−1·h−1 and oxygen excess coefficient 1.2, the 1/2CuO/NiO-CeO2 catalyst gave rise to a maximum CO conversion of about 94.8%. The 1/2CuO/NiO-CeO2 catalyst also exhibited good catalytic stability up to 100 h, showing that this catalyst system could be further developed for potential commercial application. Combined with the detailed characterization data, it had been proposed that there was a synergistic interaction among Cu, Ni and CeO2 in the catalyst, generating more oxygen vacancies than the binary CuO/CeO2 and NiO/CeO2 catalysts. With a Cu/Ni molar ratio of 1/2, the formed ternary CuO/NiO-CeO2 catalyst had the highest content of oxygen vacancies, which was believed to play a crucial role in the CO-PROX reaction.
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