期刊
JOURNAL OF POWER SOURCES
卷 261, 期 -, 页码 46-54出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.03.043
关键词
Hydrogen; Cerium-copper catalysts; Deactivation; Preferential oxidation of carbon monoxide
资金
- National Natural Science Foundation of China [21066004, 21061008]
The hydrothermal in combination with impregnation methods are used to prepare the CeO2/CuO-X catalysts with spherical structure. The catalysts are characterized via SEM, XRD, H-2-TPR, HRTEM, XPS and N-2 adsorption desorption techniques. The study shows that the microspheres of CuO consist of the sheet-like CuO and the way of arrangement results in the formation of shell structure. There is a core in the middle of shell structure, which is composed of the nano-sized CuO particles. CeO2 particles are supported on the surface of the CuO microspheres or embedded in the pores of sheet-like CuO. It is found that there is another reason for the decrease of CO conversion above 155 degrees C except H-2 competitive oxidation. It is from the change of the CeO2/CuO catalyst during CO-PROX reaction including the reduction of CuO and the separation of metallic copper from the surface of catalyst. (c) 2014 Elsevier B.V. All rights reserved.
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