Preparation of Au/ZnO Catalyst and Its Catalytic Performance for CO Oxidation at Ambient Temperature and Moisture

Abstract

Abstract: The catalytic performance of Au/ZnOcatalysts prepared by a coprecipitation method for COox-idation at ambient temperature and moisture was studied. It was found that the chemical composition, the activity and the stability of the catalysts were greatly changed with the variation of calcination temperature. The sample calcined at 240 ℃ showed the best stability, i.e. it can maintain COcomplete conversion for 600 h. XRD, FTIR, TEMand UV Vis results indicated that gold could be highly dispersed on the surface of ZnCO₃ or ZnO, with the mean diameter of gold particle being2—5 nm. The type of support was the main influencing factors on the stability of Au/ZnOcatalysts, the stability of ZnOsupported gold catalysts was better than that of the ZnCO₃ supported gold samples. The smaller of ZnOparticle and the bigger of S BET, the better of the stability of Au/ZnOcatalysts was obtained.

Key words: Au/ZnO catalyst, CO oxidation, Ambient temperature and moisture, Stability

CLC Number:

O643.36

TrendMD:

WANG Gui-Ying, LI Xue-Mei, BAI Ni, ZHANG Wen-Xiang, JIANG Da-Zhen, WU Tong-Hao . Preparation of Au/ZnO Catalyst and Its Catalytic Performance for CO Oxidation at Ambient Temperature and Moisture[J]. Chem. J. Chinese Universities, 2001, 22(3): 431.

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Preparation of Au/ZnO Catalyst and Its Catalytic Performance for CO Oxidation at Ambient Temperature and Moisture

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