科研之友
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摘要
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 H-2-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 O-2/CO, and the concentrations of CO and H-2. The temperature on the Au/Al2O3 surface can reach 170 degrees C during CO oxidation, and is decreased to 55 degrees C by addition of FeOx. These results indicate that formation of hot-spots on gamma-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 Au-III, which resulted in different reaction mechanisms of preferential oxidation of CO in the presence of H-2.
- 出版日期2012-6
- 单位滨州学院
