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Synthesis of Dimethyl Carbonate from Methanol and Supercritical Carbon Dioxide over K2CO3/ZrO2 Catalysts  

Hong, Seung Tae (Department of Chemical & Biomolecular Engineering, Sogang University)
Park, Hyung Sang (Department of Chemical & Biomolecular Engineering, Sogang University)
Lim, Jong Sung (Department of Chemical & Biomolecular Engineering, Sogang University)
Yoo, Ki-Pung (Department of Chemical & Biomolecular Engineering, Sogang University)
Publication Information
Korean Chemical Engineering Research / v.46, no.3, 2008 , pp. 550-554 More about this Journal
Abstract
The synthesis of dimethyl carbonate (DMC) from methanol and supercritical carbon dioxide over $K_2CO_3/ZrO_2$ catalysts have been studied. The catalysts were prepared by impregnating $ZrO_2$ with an aqueous $K_2CO_3$ solution. The optimum calcination temperature to disperse K species on the $ZrO_2$ surface was found to be 673 K. Monoclinic $ZrO_2$ was not active, as itself, for the DMC production. However, when the $K_2CO_3$ was impregnated on the $ZrO_2$, the catalytic performance was improved. Besides the catalyst, $CH_3I$ was used as a promoter. The $CH_3I$ promoter as well as the $K_2CO_3/ZrO_2$ catalyst was found to take an important role to improve the production of DMC. The optimum quantities for the catalyst and the promoter were estimated. The effect of the catalyst and the promoter for the DMC synthesis from methanol and supercritical carbon dioxide was investigated and the reaction mechanism was proposed.
Keywords
Dimethyl Carbonate; Supercritical Carbon Dioxide; Methanol; Zirconia; $K_2CO_3$;
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