Dimethyl Carbonate Are Researched Form Carbon Dioxide And Methanol On Copper-based Catalyst

Dimethyl carbonate （DMC） is a new type of environment-friendly organicsynthesis intermediates, It can replace the highly toxic chemicals such as dimethylsulfate, methyl chloride as the methylating reagent, can also replace the phosgene usedas a carbonyl reagent. In addition, DMC added to gasoline can not only improve theoctane number of the fuel, but also can reduce air pollution. CO₂is the main cause ofglobal warming gas, is one of a stock of a lot of potential carbon resources. CO₂andCH3OH was synthesized carbonate of dimethyl （DMC） with green chemistry andresource re-use of double meaning. This system of gas-solid reaction of CO₂andmethanol direct synthesis of DMC.This article describes the Cu_xO_y/ZnO-Al₂O₃catalyst and CeO₂modified carrierafter Cu_xO_y/ZnO-Al₂O₃-CeO₂of catalyst and H-type zeolite modifiedCu/ZnO-Al₂O₃-CeO₂/zeolite catalysts. Three types of catalytic activity and activitycenter, and the H-modified zeolite catalyst structure and the amount of acid werestudied, the DMC reaction conditions for gas-solid CO₂and methanol synthesis arediscussed. Start work as follows:1It flow co-precipitation method and impregnation method to preparedCu_xO_y/ZnO-Al₂O₃catalyst, CeO₂modified its carrier, and then the modification ofHZSM-5catalyst. Through the catalytic activity of the copper-based catalyst HZSM-5modified catalytic performance best, methanol conversion rate of7.98%. And dispersityincrease the active ingredient, the active ingredient grains smaller than the surface areaof the catalyst increases, the pore diameter becomes smaller, and the active ingredient isuniformly dispersed in the surface of the molecular sieve.2H₂-TPR and XPS characterization results can calculate the content of eachcomponent in the active center Cu_xO_y/ZnO-Al₂O₃catalyst. The three catalysts elementalcopper content was significantly higher than other copper oxide content. With elementalcopper content increases, the reduction in the content of copper oxide and cuprous oxide,the methanol conversion gradually increases.3HMCM-22HMCM-56, the hydrogen zeolite HZSM-5three kinds of catalyst C/ Z-A-Ce were modified, and three catalytic activity were compared. Over XRD and TPDcharacterization methods modified three catalysts were characterized by the activecomponent is highly dispersed in the surface of the carrier, and the greater the amountof surface acid catalyst, the better the catalytic performance. Using C/Z-A-Ce/HZSM-5catalyst ScS the reaction conditions of the system to determine the optimal reactionconditions for the system as follows: reaction pressure as1.0MPa, the reactiontemperature is230℃, the catalyst inputs for1.0g, CO₂and CH3OH molar ratio of3:1.