Preparation and Characterization of Supported Catalyst Sn2(OMe)2Cl2/SiO2 and Its Catalytic Properties for Synthesis of Dimethyl Carbonate

Abstract

Abstract: Silica supported binuclear bridged complex Sn₂(OMe)₂Cl₂/SiO₂ was prepared by surface modification. IR, TPD and micro-reactor evaluation techniques were used to characterize the surface structure, absorption properties and reactivity of Sn₂(OMe)₂Cl₂/SiO₂. The results indicate that the Cl^-is the ligands of Sn₂(OMe)₂Cl₂/SiO₂ , bis-μ-OMe bridged Sn₂(OMe)₂ can be formed between the two Sn⁴⁺metal ions and bonded on the surface of SiO₂ by Sn-O-Si bonds; CO₂ can be chemisorbed on Sn₂(OMe)₂₂/SiO₂ catalyst to form bridged adsorption state and methyl carbonate species, CH₃OH can be chemisorbed on the catalyst to form molecular adsorption state. At the reaction temperature 413 K, the Sn₂(OMe)₂Cl₂/SiO₂ catalyst has almost 100% DMC selectivity for DMC direct synthesis from CO₂ and CH₃OH. The mechanism for DMC synthesis from CO₂ and CH₃OH on the surface of Sn₂(OMe)₂Cl₂/SiO₂ is proposed based on the experimental results. The reactants CO₂ and CH₃OH co-adsorbing at the same active site on the surface of Sn₂(OMe)₄/SiO₂ and the formation of methoxy carbonate species of CO₂ on the surface of the catalyst were the critical steps for the DMC synthesis.

Key words: Binuclear bridged complex, Supported complex catalyst, CO₂, CH₃OH, Synthesis of dimethyl carbonate

CLC Number:

O643.32

TrendMD:

ZHONG Shun-He, CHENG Qing-Yan, LI Han-Sheng . Preparation and Characterization of Supported Catalyst Sn₂(OMe)₂Cl₂/SiO₂ and Its Catalytic Properties for Synthesis of Dimethyl Carbonate[J]. Chem. J. Chinese Universities, 2003, 24(1): 125.

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Preparation and Characterization of Supported Catalyst Sn₂(OMe)₂Cl₂/SiO₂ and Its Catalytic Properties for Synthesis of Dimethyl Carbonate

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