ZrO _ 2/Al _ 2O _ 3, K2O-ZrO _ 2/Al _ 2O _ 3, MgO-ZrO _ 2/Al _ 2O _ 3, V2O5-ZrO _ 2/Al _ 2O _ 3 supported composite carriers were prepared by the equal volume impregnation-precipitation method, and Cu-Ni was loaded on the carriers.

A bimetallic catalyst was prepared. Use carbon dioxide TPD, ammonia TPD

The surface acid-base characteristics, reduction performance and catalytic activity of bimetallic catalysts were characterized by H2-TPR and microreaction technology. The results show that there are metal center Cu-Ni alloy, Lewis acid center Zrn+ and Lewis on Cu-Ni catalyst.

Three kinds of active centers: Zr = O； in alkali site; CO2 can be produced under the synergistic effect of metal sites and Lewis acid sites.

M-(CO)-O→Zrn+ in horizontal adsorption state is highly reactive and can be dissociated into M-CO and Zr = O；; Under the synergistic effect of Lewis acid center and Lewis base center, CH3OH can form dissociated adsorbed Zr-OCH3 and Zr-OH. Then, M-CO reacts with Zr-OCH3 to generate DMC. Copper and Nickel Supported on Modified Composite Carrier Doped with K2O, Magnesium Oxide and Vanadium pentoxide

The reduction temperature of bimetallic catalyst increased, and ZrO/Al2O3 modified by V2O5 supported Cu-Ni.

Bimetallic catalyst has strong surface acid center; MgO modified ZrO _ 2/Al _ 2O _ 3 composite carrier loaded with Cu-Ni.

The surface basicity of bimetallic catalyst is the strongest; The activity of ZrO/Al2O3 composite supported catalyst modified by V2O5 increases with the increase of the number of acid sites on the surface.

Keywords: dimethyl carbonate (DMC); Bifunctional catalyst; Carbon dioxide; methyl alcohol

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