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- W2364056095 abstract "Two novel solid acids of SO2-4/ZnO and S2O2-8/ZnO were prepared by impregnating H2SO4, (NH4)2S2O8 solution respectively on amorphous zinc oxide and calcining at 500—600 ℃, and then used as carriers to prepare Cu(Ⅰ)/SO2-4/ZnO and Cu(Ⅰ)/S2O2-8/ZnO catalysts via solid-state ion-exchange. The solid acids and catalysts were characterized by XRD, FTIR, TPD and TPR. It is observed that Zn3O(SO4)2 was formed during the preparation of the solid acids, and both of Lewis and Brnsted acid sites were formed on SO2-4/ZnO and S2O2-8/ZnO. NH3-TPD shows that both SO2-4/ZnO and S2O2-8/ZnO were very strong solid acids because the temperature of NH3 desorption peaks were above 543 ℃. It is suggested by molecule structure analysis that the form of acid sites is due to the strongly electronic inductive effect of SO2-4, the bridge-coordination complex of ZnO and SO2-4 causes the formation of Brnsted and Lewis acid sites on the surface, but the chelate-coordination complex of ZnO and SO2-4 has not any contribution to acid sites. Prepared by solid-state ion-exchange with the solid acids and CuCl at high temperature in N2 follow, Cu(Ⅰ)/SO2-4/ZnO and Cu(Ⅰ)/S2O2-8/ZnO catalysts, in which Cu(Ⅰ) was easy to be reduced, showed an excellent catalytic behavior in the oxidative carbonylation of methanol to dimethyl carbonate(DMC). Both of the catalysts showed high catalytic activity and selectivity: 98.13% selectivity of DMC based on methanol and 1.87 g/(g·h) space-time yield, respectively." @default.
- W2364056095 created "2016-06-24" @default.
- W2364056095 creator A5033760502 @default.
- W2364056095 date "2008-01-01" @default.
- W2364056095 modified "2023-09-25" @default.
- W2364056095 title "Preparation and Characterization of Cu(I)/SO_4~(2-)/ZnO and Cu(I)/S_2O_8~(2-)/ZnO Catalysts" @default.
- W2364056095 hasPublicationYear "2008" @default.
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