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Acta Phys. -Chim. Sin.  2012, Vol. 28 Issue (06): 1455-1460    DOI: 10.3866/PKU.WHXB201203303
CATALYSIS AND SURFACE SCIENCE     
Novel Method of Controlling Formation of Hot-Spot over Gold Catalysts for CO Oxidation
WANG Fang, WANG Cai-Hong, LI Da-Zhi
Department of Chemistry & Chemical Engineering, Binzhou University, Binzhou 256603, Shandong Province, P. R. China
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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°C during CO oxidation, and is decreased to 55°C 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.

Key wordsCO oxidation      Dopant      Gold catalyst      Hot-spot     
Received: 13 December 2011      Published: 30 March 2012
MSC2000:  O643  
Fund:  

The project was supported by the Research Fund of Binzhou University, China (2010Y06).

Corresponding Authors: WANG Fang     E-mail: wangfangosso@yahoo.cn
Cite this article:

WANG Fang, WANG Cai-Hong, LI Da-Zhi. Novel Method of Controlling Formation of Hot-Spot over Gold Catalysts for CO Oxidation. Acta Phys. -Chim. Sin., 2012, 28(06): 1455-1460.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201203303     OR     http://www.whxb.pku.edu.cn/Y2012/V28/I06/1455

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