催化作用
近程
拉曼光谱
材料科学
化学工程
X射线光电子能谱
金属有机骨架
空位缺陷
色散(光学)
金属
纳米技术
吸附
化学
结晶学
物理化学
一氧化碳
有机化学
冶金
工程类
物理
光学
作者
Lei Wang,Huan Peng,Shunli Shi,Zhuo Hu,Bingzhen Zhang,Shunmin Ding,Shuhua Wang,Chao Chen
标识
DOI:10.1016/j.apsusc.2021.151611
摘要
Derivation of CuO/CeO2 catalyst from metal-organic framework (MOF) precursor is able to facilitate the dispersion of active sites, resulting in an enhanced catalytic performance for preferential CO oxidation in H2-rich stream (CO-PROX). However, parts of the Cu-O-Ce active interfaces are usually sintered inside the catalyst, which will reduce the catalytic performance. To solve such problem and fully expose the catalytic active sites, herein, we design and synthesize a hollow spherical CeO2 supporting Cu3(BTC)2 precursor shell and then pyrolyze it to generate CuO/CeO2-S catalyst. The results demonstrated by the various characterizations such as PXRD, TEM, H2-TPR, O2-TPD, Raman and XPS are as follows: The quantitative Cu active species are achieved by controlling the loading layer of MOFs; The hollow structure can avoid the active Cu-O-Ce interface being coated inside; The CeO2-S provides the lowest loading energy of Cu and more oxygen vacancy. Further in-situ analysis of Raman and DRIFTs as well as kinetic detects exhibit the highest interfacial active Cu species ratio and Ce3+ concentration of the CuO/CeO2-S, comparing to catalysts with diverse morphologies and traditional impregnation method from MOF precursors. The as-synthesized CuO/CeO2-S-10-700 displays nearly 100% CO conversion at ca. 80 °C and outstanding stability for CO-PROX.
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