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Received December 7, 2010
Accepted January 21, 2011
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Direct synthesis of dimethyl carbonate from methanol and carbon dioxide over H3PW12O40/CeXZr1.XO2 catalysts: Effect of acidity of the catalysts
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Gwanak-gu, Seoul 151-744, Korea 1Department of Chemical Engineering, Myongji University, Yongin 449-728, Korea
inksong@snu.ac.kr
Korean Journal of Chemical Engineering, July 2011, 28(7), 1518-1522(5), 10.1007/s11814-011-0020-x
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Abstract
CeXZr1-XO2 catalysts were prepared by a sol-gel method, and H3PW12O40/CeXZr1-XO2 catalysts were then prepared by an impregnation method. Both catalysts were applied to the direct synthesis of dimethyl carbonate from methanol and carbon dioxide in a batch reactor. NH3-TPD experiments were carried out to investigate the effect of acidity on the catalytic performance of CeXZr1-XO2 and H3PW12O40/CeXZr1-XO2. Catalytic performance of CeXZr1-XO2 and H3PW12O40/CeXZr1-XO2 was closely related to the acidity of the catalysts. The amount of dimethyl carbonate produced over both CeXZr1-XO2 and H3PW12O40/CeXZr1-XO2 catalysts increased with increasing acidity of the catalysts. This indicates that acidity of the catalyst played a key role in determining the catalytic performance of CeXZr1-XO2 and H3PW12O40/_x000D_
CeXZr1-XO2 in the direct synthesis of dimethyl carbonate from methanol and carbon dioxide. Catalytic activity of H3PW12O40/CeXZr1-XO2 was higher than that of the corresponding CeXZr1-XO2. The enhanced catalytic performance of H3PW12O40/CeXZr1-XO2 was attributed to the Brønsted acid sites provided by H3PW12O40-.
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