Comparative study between gas phase and liquid phase for the production of DMC from methanol and CO_2  

作　　者：Ahmed Aouissi Salem S. Al-Deyab 

机构地区：[1]Department of Chemistry, King Saud University

出　　处：《Journal of Natural Gas Chemistry》2012年第2期189-193,共5页天然气化学杂志（英文版）

基　　金：the Deanship of Scientific Research at King Saud University for funding the work through the research group project (No. RGP-VPP-116)

摘　　要：Direct synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide over Co1.5PW12O40 in liquid and in gas phase is investigated. The synthesized catalyst has been characterized by means of FTIR and XRD. Liquid phase experiment results showed that high pressures are favorable for the synthesis of DMC. However, DMC formation is limited by the reaction with co-produced water. DMC selectivity is more strongly dependent on the temperature than on the pressure of CO2. As for the reactions in gas phase, it has been found that both CH3OH conversion and DMC selectivity decreased with increasing temperature, owing to the decomposition of DMC at high temperatures. High temperatures and more amount of Co1.5PW12O40 catalyst favor the formation of dimethoxymethane （DMM） and methyl formate （MF）.Direct synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide over Co1.5PW12O40 in liquid and in gas phase is investigated. The synthesized catalyst has been characterized by means of FTIR and XRD. Liquid phase experiment results showed that high pressures are favorable for the synthesis of DMC. However, DMC formation is limited by the reaction with co-produced water. DMC selectivity is more strongly dependent on the temperature than on the pressure of CO2. As for the reactions in gas phase, it has been found that both CH3OH conversion and DMC selectivity decreased with increasing temperature, owing to the decomposition of DMC at high temperatures. High temperatures and more amount of Co1.5PW12O40 catalyst favor the formation of dimethoxymethane （DMM） and methyl formate （MF）.

关 键 词：HETEROPOLYANION Keggin structure METHANOL dimethyl carbonate carbon dioxide 

分 类 号：TQ225.52[化学工程—有机化工]