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用等体积浸渍法制备了ZrO2 SiO2 (ZrSiO)表面复合氧化物负载的Cu Ni催化剂 ,并用IR ,TPR ,TPD及微反技术考察了K2 O助剂对CO2 和CH3OH在Cu Ni/ZrSiO催化剂表面上的吸附及合成碳酸二甲酯 (DMC)反应性能的影响 .结果表明 :加入K2 O助剂使CO2 在催化剂表面上的吸附增强 ,当n(K) /n(Cu +Ni) =15 %时 ,CO2 在催化剂表面上吸附后生成K2 CO3;CH3OH在催化剂表面上的解离吸附态 (CH3O-和H+)的吸附减弱 ;CO2 和CH3OH在Cu Ni/ZrSiO催化剂表面上反应的主要产物为DMC ,H2 O ,CO和CH2 O ;随着K2 O助剂的加入 ,反应转化率及DMC选择性提高 ,副产物 (CO和CH2 O)的选择性下降 .根据实验结果 ,探讨了K2 O对催化剂表面活性中心电荷分布的影响 .
The Cu-Ni catalyst supported on ZrO2 SiO2 (ZrSiO) surface was prepared by the same volume impregnation method. The effect of K2 O on the surface of Cu Ni / ZrSiO catalyst was investigated by IR, TPR, TPD and micro- (DMC). The results show that the adsorption of CO2 on the surface of catalyst increases with the addition of K2 O promoter. When n (K) / n (Cu + Ni) = 15% , And CO2 was adsorbed on the surface of the catalyst to generate K2 CO3. The adsorption of CH3OH on the surface of the catalyst was weaker than that of the adsorbed state (CH3O- and H +). The main products of the reaction of CO2 and CH3OH on the surface of Cu Ni / ZrSiO catalyst were DMC, H2 O, CO and CH2 O. With the addition of K2 O promoter, the reaction conversion and DMC selectivity increased, and the selectivity of by-products (CO and CH2 O) decreased.According to the experimental results, the effect of K2 O on the surface of catalyst Effect of active center charge distribution.