Abstract
The catalytic activities of Re–Co/CeO 2 bimetallic catalysts for the water gas shift (WGS) reaction were investigated and compared with activities of Co/CeO 2. It was found that the rate of WGS reaction over Re–Co/CeO 2 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/CeO 2 indicate that Re promotes the reduction of surface ceria to Ce 2O 3 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 XANES also indicated that electron densities were withdrawn from Co d-state to Re, leading to weaker Co-adsorbate bonds.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.
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