吗啉离子液体型催化剂催化合成碳酸甲乙酯OA

Cetyl trimethyl ammonium bromide,N-(3-(trimethoxysilylpropyl))-N-methyl morpholinium chloride([MMpSi]Cl),and tetraethyl orthosilicate were used as raw materials to prepare morpholinium ionic liquid-type MCM-41-x[MMpSi]OH catalysts.The obtained MCM-41-x[MMpSi]OH catalysts were characterized by FTIR,TG,N2 adsorption-desorption,small-angle XRD,and CO2-TPD.The catalytic performance of MCM-41-x[MMpSi]OH was studied through the optimal process conditions of the transesterification between ethanol and dimethyl carbonate(DMC)to produce ethyl methyl carbonate(EMC).Experimental results exhibit that the alkali amount of MCM-41-x[MMpSi]OH catalyst increased with the increase of[MMpSi]Cl loading,the MCM-41-0.075[MMpSi]OH catalyst with 0.075[MMpSi]Cl loading(mole fraction)had moderate alkali amount and the best catalytic performance.Under optimal conditions of an ethanol/DMC molar ratio of 4∶1,80℃,5 h,and catalyst dosage 1.5%(w),EMC yield over MCM-41-0.075[MMpSi]OH reaches 65.0%(w)with EMC selectivity of 93.2%.The catalytic activity remains stable after 10 consecutive reuse cycles.