EFFECTS OF PROMOTERS OVER MESOPOROUS PDCL2-CUCL2/HMS CATALYSTS FOR OXIDATIVE CARBONYLATION OF ETHANOL TO DIETHYL CARBONATE

摘要

Diethyl carbonate (DEC), an environmentally benign chemical, represents a viable alternative to tert-butyl ether (MTBE) in the chemical industry and in the motor fuel industry. Among several routes for DEC production, the vapor phase oxidative carbonylation of ethanol represents one of the proposed favorable processes. In the present work, the effects of the various quaternary ammonium salt (QAS) promoters over mesoporous HMS supported PdCl2-CuCl2 catalysts were investigated for the synthesis of diethyl carbonate by oxidative carbonylation of ethanol. The possible modification mechanism of promoters for the surface structure of catalysts was proposed to explain that the promoter facilitate the better dispersal of active species on the surface of the catalysts.