Citation: WANG Fang, WANG Cai-Hong, LI Da-Zhi. Novel Method of Controlling Formation of Hot-Spot over ld Catalysts for CO Oxidation[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1455-1460. doi: 10.3866/PKU.WHXB201203303 shu

Novel Method of Controlling Formation of Hot-Spot over ld Catalysts for CO Oxidation

1.
Department of Chemistry & Chemical Engineering, Binzhou University, Binzhou 256603, Shandong Province, P. R. China

Received Date: 13 December 2011
Available Online: 30 March 2012
Fund Project: 滨州学院科研基金(2010Y06)资助项目 (2010Y06)

Au catalysts supported on Al₂O₃ and MO_x-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°C during CO oxidation, and is decreased to 55°C by addition of FeO_x. These results indicate that formation of hot-spots on γ-alumina-supported ld 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 H₂.
- CO oxidation,
- Dopant,
- ld catalyst,
- Hot-spot
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