Direct synthesis of dimethyl carbonate from methanol and carbon dioxide over H_3PW_(12)O_(40)/Ce_XZr_(1−X)O_2 catalysts: Effect of acidity of the catalysts

다국어 초록 (Multilingual Abstract)

Ce_XZr_(1-x)O_2 catalysts were prepared by a sol-gel method, and H_3PW_12O_40/Ce_XZr_(1−X)O_2 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. NH_3-TPD experiments were carried out to investigate the effect of acidity on the catalytic performance of Ce_XZr_(1−X)O_2 and H3PW12O40/CeXZr_(1−X)O2. Catalytic performance of Ce_XZr_(1−X)O_2and H_3PW_(12)O_(40)/Ce_XZr_(1−X)O_2 was closely related to the acidity of the catalysts. The amount of dimethyl carbonate produced over both Ce_XZr_(1−X)O_2 and H_3PW_(12)O_(40)/Ce_XZr_(1−X)O_2 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 Ce_XZr_(1−X)O_2 and H_3PW_(12)O_(40)/Ce_XZr_(1−X)O_2 in the direct synthesis of dimethyl carbonate from methanol and carbon dioxide. Catalytic activity of H_3PW_(12)O_(40)/Ce_XZr_(1−X)O_2 was higher than that of the corresponding Ce_XZr_(1−X)O-2. The enhanced catalytic performance of H_3PW_(12)O?_(40)/Ce_XZr_(1−X)O_2 was attributed to the Brønsted acid sites provided by H_3PW_(12)O_(40).

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