Abstract
Au catalysts supported on Al2O3 and MOx-Al2O3(M=Fe and Zn) were prepared by the deposition-precipitation method.Their catalytic activities for CO oxidation in the absence and presence of an H2-rich steam at room temperature were investigated in detail.Catalyst bed temperatures were determined directly by a thermocouple.The catalyst surface temperature depended on the volume ratio of O2/CO,and the concentrations of CO and H2.The temperature on the Au/Al2O3 surface can reach 170 ℃ during CO oxidation,and is decreased to 55 ℃ by addition of FeOx.These results indicate that formation of hot-spots on γ-alumina-supported gold catalysts could be controlled by adding an appropriate dopant.The structure of the catalysts was characterized by techniques such as X-ray powder diffraction,X-ray photoelectron spectroscopy and transmission electron microscopy.Addition of a dopant could transfer the active center from Au to AuIII,which resulted in different reaction mechanisms of preferential oxidation of CO in the presence of H2.
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