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Acta Physico-Chimica Sinica  2000, Vol. 16 Issue (03): 226-231    DOI: 10.3866/PKU.WHXB20000307
Article     
Cu-Ni/V2O5-SiO2 Catalyst for the Direct Synthesis of Dimethyl Carbonate from Carbon Dioxide and Methanol
Zhong Shun-He, Li Han-Sehng, Wang Jian-Wei, Xiao Xiu-Fen
College of Chemical Engineering and Technology,Tianjin University,Tianjin 300072
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Abstract  

The surface complex support of V2O5-SiO2(VSiO) was prepared by the method of surface reaction modification. VSiO supported Cu-Ni bimetallic catalysts were made using isovolumic impregnation. Adsorption and reaction of CO2 and CH3OH on catalyst were characterized by IR, TPD, TPSR and micro-reactor techniques. The results show that three active sites exist on Cu-Ni/VSiO catalyst: metal site(Cu-Ni alloy, denoted M), Lewis acid site(Vn+)and Lewis basic site(V=O); horizontally adsorped CO2, formed by shearingly adsorbed CO2 on M in cooperation with the adjacent Vn+, can dissociate into M-CO and V=O at about 138 ℃and methanol dissociated into V-OCH3 and V-OH cooperated with Vn+ and adjacent V=O; the mainly reaction products of the reaction of CO2 and CH3OH on Cu-Ni/VSiO catalyst are DMC (with selectivity over 85%), CH2O, CO and H2O.



Key wordsCarbon dioxide      Methanol      Dimethyl carbonate      V2O5-SiO2 complex support      Binetallic catalyst      Surface reaction     
Received: 24 June 1999      Published: 15 March 2000
Corresponding Authors: Zhong Shun-He   
Cite this article:

Zhong Shun-He, Li Han-Sehng, Wang Jian-Wei, Xiao Xiu-Fen. Cu-Ni/V2O5-SiO2 Catalyst for the Direct Synthesis of Dimethyl Carbonate from Carbon Dioxide and Methanol. Acta Physico-Chimica Sinica, 2000, 16(03): 226-231.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20000307     OR     http://www.whxb.pku.edu.cn/Y2000/V16/I03/226

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