OXIDATIVE CARBONYLATION OF METHANOL TO DIMETHYL CARBONATE BY CHLORINE-FREE HOMOGENEOUS AND IMMOBILIZED 2,2-BIPYRIMIDINE MODIFIED COPPER CATALYST

摘要

A chlorine-free catalyst,prepared in situ from Cu(II)acetate and 2,2'-bipyrimidine,can be used for the oxidative carbonylation of methanol to dimethyl carbonate.In situ high pressure IR and NMR spectroscopic studies suggest the formation of [Cu(2,2'-bipyrimidine)(CO)-(OMe)] as one of the key intermediates.The catalytic performance of the 2,2'-bipyrimidine-modified Cu-catalyst is similar to the CuCl-based system.The chlorine free catalyst can be immobilized by using the copolymer of 5-vinyl-2,2'-bipyrimidine and styrene.