St. King, OXIDATIVE CARBONYLATION OF METHANOL TO DIMETHYL CARBONATE BY SOLID-STATE ION-EXCHANGED CUY CATALYSTS, Catalysis today, 33(1-3), 1997, pp. 173-182
The chloride free ion-exchanged Cu(II)Y is inactive for oxidative carb
onylation of methanol to dimethyl carbonate. However, the Cu(I)Y as pr
epared from a solid-state ion-exchange method is very active. Ammonia
can facilitate the copper migration into zeolite cages at low temperat
ure (150 degrees C). The reaction mechanism was studied by in-situ FTI
R. The formation of copper methoxide in the zeolite cages during the o
xidation of methanol is the first step. The insertion of carbon monoxi
de into copper methoxide is the rate-limiting step. Methanol is requir
ed for the desorption of dimethyl carbonate (DMC) in zeolite cages.