LIU Chunxiu, WANG Jiang, Sagara, FENG Mengjie, CHEN Xiaodan, JIA Meilin*, Zhaorigetu
(Inner Mongolia Key Laboratory of Green Catalysis, College of Chemistry and Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China)
Abstract: A series of gold catalysts were prepared by deposition-precipitation method and solution reduction method respectively. The catalytic oxidation of glyoxal to glyoxylic acid in the presence of O2 was taken as the probe reaction for comparing the catalyst activity. The influence of reaction conditions on the catalytic activity was investigated. These catalysts were characterized by X-ray diffraction, AAS, UV-Vis spectrum and XPS. The results demonstrated that the catalyst Au/ZrO2(L) prepared by solution reduction method showed higher activity than that from deposition-precipitation method, with the 6.2% glyoxalic acid yield at the pH of 7.7 and reaction temperature of 323 K. The high activity of Au/ZrO2(L) might be resulted from the high actual gold loading and the existence of Au0.
Key words: Gold catalyst; glyoxal; glyoxalic acid
E-mail: jml@imnu.edu.cn
Journal of Molecular Catalysis, Vol. 26, Issue 4, 2012,322-327
