Abstract
The Cu(I)Y catalyst, as prepared by solid-state ion exchange at 650°C, shows higher productivity and less deactivation than the known carbon-supported CuCl2catalyst for gas-phase oxidative carbonylation of methanol to make dimethyl carbonate. The ion-exchanged Cu(II)Y showed very little activity for the same reaction. Anin situFTIR technique was applied to elucidate the reaction mechanism. The first step is the oxidation of methanol and Cu(I) to from Cu(II)–methoxide. The insertion of CO to Cu(II)–methoxide, forming probably a carbomethoxide, is the rate-limiting step. Finally, methanol and oxygen react with carbomethoxide to from dimethyl carbonate.
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