采用表面反应改性法制备了V2O5 SiO2(VSiO)表面复合物 ,用等体积浸渍法制备了VSiO担载的Cu Ni双金属催化剂 ,用IR、TPD、TPSR和微反技术研究了CO2 和CH3OH在催化剂表面上的化学吸附与反应性能.结果表明,在Cu Ni/VSiO催化剂上存在着金属位Cu Ni合金、Lewis酸位Vn +和Lewis碱位V=O三类活性中心 ;CO2 在金属位和Lewis酸位协同作用下可生成CO2卧式吸附态M -(CO) -O→Vn + ,此吸附态在138℃左右可解离成M -CO和V=O ;CH3OH在Lewis酸位和Lewis碱位协同作用下可形成解离吸附态V -OCH3和V -OH ;CO2 和CH3OH在Cu Ni/VSiO催化剂表面上的反应产物主要为碳酸二甲酯(DMC)、CH2O、CO和H2O ,其生成DMC的选择性在85%以上. V2O5 SiO2 (VSiO) surface composites were prepared by the surface reaction modification method. The Cui Ni bimetallic catalysts supported by VSiO were prepared by the same volume impregnation method. The effects of CO2 and CH3OH on the surface properties were studied by IR, TPD, TPSR and micro- The results show that Cu Ni / VSiO catalyst has three active sites: Cu Ni metal, Lewis acid Vn and Lewis basic V = O. Lewis acid sites can generate CO 2 horizontal adsorption state M - (CO) -O → Vn +. The adsorption state can be dissociated to M-CO and V = O at about 138 ℃. The reaction products of CO2 and CH3OH on the surface of Cu Ni / VSiO catalyst are mainly dimethyl carbonate (DMC), CH2O, CO and H2O The selectivity of DMC is above 85%.