Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (03): 226-231.doi: 10.3866/PKU.WHXB20000307

• ARTICLE • Previous Articles     Next Articles

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   

  1. College of Chemical Engineering and Technology,Tianjin University,Tianjin 300072
  • Received:1999-06-24 Revised:1999-09-14 Published:2000-03-15
  • Contact: Zhong Shun-He

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 words: Carbon dioxide, Methanol, Dimethyl carbonate, V2O5-SiO2 complex support, Binetallic catalyst, Surface reaction