title: Direct synthesis of dimethyl carbonate from methanol and carbon dioxide over CeO2(X)-ZnO(1-X) nano-catalysts.
abstract: CeO2(X)-ZnO(1-X) (X = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0) nano-catalysts were prepared by a co-precipitation method with a variation of CeO2 content (X, mol%), and they were applied to the direct synthesis of dimethyl carbonate from methanol and carbon dioxide. Successful formation of CeO2(X)-ZnO(1-X) nano-catalysts was well confirmed by XRD analysis. The amount of DMC produced over CeO2(X)-ZnO(1-X) catalysts exhibited a volcano-shaped curve with respect to CeO2 content. Acidity and basicity of CeO2(X)-ZnO(1-X) nano-catalysts were measured by NH3-TPD and CO2-TPD experiments, respectively, to elucidate the effect of acidity and basicity on the catalytic performance in the reaction. It was revealed that the catalytic performance of CeO2(X)-ZnO(1-X) nano-catalysts was closely related to the acidity and basicity of the catalysts. Amount of dimethyl carbonate increased with increasing both acidity and basicity of the catalysts. Among the catalysts tested, CeO2(0.7)-ZnO(0.3) with the largest acidity and basicity showed the best catalytic performance in the direct synthesis of dimethyl carbonate from methanol and carbon dioxide.
authors.affiliation: School of Chemical and Biological Engineering, Institute of Chemical Processes, World Class University Program of Chemical Convergence for Energy and Environment, Seoul National University, Shinlim-dong, Kwanak-ku, Seoul 151-744, South Korea.
authors.forename: Ki Hyuk
authors.initials: KH
authors.lastname: Kang
authors.forename: Wangrae
authors.initials: W
authors.lastname: Joe
authors.forename: Chang Hoon
authors.initials: CH
authors.lastname: Lee
authors.forename: Mieock
authors.initials: M
authors.lastname: Kim
authors.forename: Dong Baek
authors.initials: DB
authors.lastname: Kim
authors.forename: Boknam
authors.initials: B
authors.lastname: Jang
authors.forename: In Kyu
authors.initials: IK
authors.lastname: Song
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D005561:Formates / Q000138:chemical synthesis*; D000432:Methanol / Q000737:chemistry*; D049329:Nanostructures; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005561:Formates; D002245:Carbon Dioxide; D002563:Cerium; C030583:ceric oxide; C023025:methyl carbonate; D015034:Zinc Oxide; D000432:Methanol