Effect of Precipitant on the Performances and Structures of Au/ZnO Catalysts for CO Oxidation

Abstract

Abstract: Various Au/ZnOcatalysts were prepared by a coprecipitation method with four kinds of precipitants, Na₂CO₃, (NH₄)₂CO₃, NaOHand NH₄OH, and the catalytic performance of COoxidation at an ambient temperature and humidity were studied. It was found that the precipitants play an important role for the Au/ZnOcatalyst structure, such as the precursors, the particle size of ZnOand metallic gold and the BETsurface area of Au/Zn Ocatalysts. The sample prepared by using NH₄OHas precipitant exhibited a lower activity and poorer stability, while the Au/ZnOcatalysts prepared by other three precipitants can maintain COcompletely oxidized to CO₂ for at least1100 h. The feed gas mixture can result in sintering of metallic gold and accumulation of carbonate like species on the surface of Au/ZnOcatalysts during the CO-oxidation process. The stability is related to the rate of gold sintering and the amount of hydrozincite formed on the catalyst surface.

Key words: Au/ZnO, Precipitant, CO oxidation, Activity, Stability

CLC Number:

O641

TrendMD:

WANG Gui-Ying, LIAN Hong-Lei, XU Yue, ZHANG Wen-Xiang, JIANG Da-Zhen, WU Tong-Hao . Effect of Precipitant on the Performances and Structures of Au/ZnO Catalysts for CO Oxidation[J]. Chem. J. Chinese Universities, 2001, 22(11): 1873.

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Effect of Precipitant on the Performances and Structures of Au/ZnO Catalysts for CO Oxidation

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