期刊
APPLIED SURFACE SCIENCE
卷 566, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150707
关键词
Preferential oxidation of CO in H-2; CO oxidation; Copper based catalyst; Ceria(110); Quasi in-situ XPS and HS-LEIS
类别
资金
- National Natural Science Foundation of China [21872110]
- National Key Research and Development Program of China [2020YFB0606401]
Stabilizing Cu+ on the surface of CeO2 was found to achieve high selectivity for CO oxidation, while Cu-0 was more favorable for H-2 oxidation at higher temperatures.
Ceria nanosheets with predominantly exposing {110} planes had been synthesized, and used as supports to prepare copper-based catalysts for preferential oxidation of CO from hydrogen rich fuel (PROX). The 3 wt% CuO/CeO2 (110) catalyst shows excellent catalytic performance, achieving Con. 100% and Sel. 99.8% at 90 degrees C after a pretreatment with the reaction gas. Quasi in-situ XPS and HS-LEIS results, as well as CO-DRIFTS, reveal that the relative ratio and dispersion of Cu+ on the surface increase after treating with the reaction gas. These results disclose that the interface between Cu+ and CeO2 should play main roles for CO oxidation. The obtained apparent activation energy for hydrogen oxidation is much higher than that for CO oxidation. The selectivity for H-2 oxidation increases significantly and Cu-0 appears concurrently at a higher reaction temperature, leading that Cu-0 is more favor for H-2 oxidation. Therefore, to stabilize Cu+ on CeO2 is the key to achieve high catalytic performance for PROX.
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