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, Jae-Cheon Koh, Dae-Won Park* and Kee-Kahb Koo**Alternative Chemicals/Fuel Research Center, Green Chemistry Division, Korea Research Institute of Chemical Technology,Jang-dong 100, Yuseong-gu, Daejeon 305-606, Korea*Department of Chemical Engineering, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea**Department of Chemical & Biomolecular Engineering, Sogang University, 1, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea(Received 24 February 2011; accepted 20 March 2011)

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Effect of Metal Oxide Catalysts and Ionic Liquids on the Synthesis of Methyl Carbamate and Dimethyl Carbonate from Urea and Methanol under High Pressure Reaction System