Abstract
The effects of CeO 2 contents and silica carrier porosity with their pore diameters ranging from 5.2 nm to 12.5 nm of CuO–CeO 2/SiO 2 catalysts in CO oxidation were investigated. The catalysts were characterized by N 2 adsorption/desorption at low temperature, X-ray diffraction (XRD), temperature-programmed reduction by H 2 (H 2-TPR), oxygen temperature programmed desorption (O 2-TPD) and X-ray photoelectron spectroscopy (XPS). The results suggested that, the ceria content and the porosity of SiO 2 carrier possessed great impacts on the structures and catalytic performances of CuO-CeO 2/SiO 2 catalysts. When appropriate content of CeO 2 (Ce content ≤ 8 wt%) was added, the catalytic activity was greatly enhanced. In the catalyst supported on silica carrier with larger pore diameter, higher dispersion of CuO was observed, better agglomeration-resistant capacity was displayed and more lattice oxygen could be found, thus the CuO-CeO 2 supported on Si-1 showed higher catalytic activity for low-temperature CO oxidation.
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