期刊
APPLIED SURFACE SCIENCE
卷 573, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151611
关键词
Hollow nano-sphere; Metal-organic framework precursor; Fully exposed Cu-O-Ce interface; CuO/CeO2 catalyst; Preferential CO oxidation
类别
资金
- National Natural Science Foundation of China [21661020, 21961021, 22002056]
- Natural Science Foundation of Jiangxi Province [20202ACB203001]
- Graduate Innovative Special Fund Projects of Jiangxi Province [YC2020-B004]
By designing and synthesizing a hollow spherical CeO2 supporting Cu-3(BTC)(2) precursor shell to generate CuO/CeO2-S catalyst, the dispersion of active sites can be improved and sintering of active interfaces can be avoided, leading to enhanced catalytic performance for preferential CO oxidation in H-2-rich stream.
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 H-2-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 Cu-3(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, H-2-TPR, O-2-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 degrees C and outstanding stability for CO-PROX.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据