Abstract
Abstract CeO2/SiO2 and CeO2/Al2O3 catalysts oxidized at 1173 K in O2 stream were employed to investigate the catalytic activity for methane combustion and the behavior of CeO2 on supports by the oxidation at 1173 K. CeO2/SiO2 catalyst gave a poor catalytic activity by comparison with that of CeO2/Al2O3 catalyst. The crystallite size of CeO2 of the silica catalyst was found to be 1.5 times larger. In addition, Auger Electron Spectroscopy (AES) analysis after the oxidation at 1173 K proved that cerium species existed on and within the silica support. We conclude that the low surface density of CeO2 might contribute to the poor activity of CeO2/SiO2 catalyst for methane combustion.
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