期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 340, 期 1-2, 页码 39-47出版社
ELSEVIER
DOI: 10.1016/j.molcata.2011.03.006
关键词
Re-Co bimetallic catalyst; X-ray absorption near edge structure; Water gas shift reaction; Oxygen vacancies
资金
- Center of Excellence for Innovation in Chemistry (PERCH-CIC)
- Commission on Higher Education
- Ministry of Education and the National Nanotechnology Center
- National Science and Technology Development Agency
The catalytic activities of Re-Co/CeO2 bimetallic catalysts for the water gas shift (WGS) reaction were investigated and compared with activities of Co/CeO2. It was found that the rate of WGS reaction over Re-Co/CeO2 bimetallic catalysts was higher than that of a single catalyst of Co on ceria. It seems that Re influences the catalysts and the catalyst performance in several ways. XRD and Raman spectroscopy results indicate that metal oxides were dispersed on ceria surface and H-2-chemisorption indicated better dispersion of Co on the ceria surface upon addition of Re. X-ray absorption near edge structure (XANES) spectra of Re-Co/CeO2 indicate that Re promotes the reduction of surface ceria to Ce2O3 and provides oxygen vacancies that facilitate the redox process at the surface. XANES also indicated that electron densities were withdrawn from Co d-state to Re, leading to weaker Co-adsorbate bonds. All of these effects contribute to an increase in the WGS reaction rate. (C) 2011 Elsevier B.V. All rights reserved.
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