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采用均匀沉淀法制备了不同SiO_2含量的CuO-ZnO作为CO_2加氢合成甲醇的活性组分,接着采用研磨法将其与HZSM-5分子筛均匀混合形成双功能催化剂,考察了不同SiO_2含量催化剂在CO_2加氢合成二甲醚反应中的催化性能.通过XRD、N_2等温吸附脱附、H_2-TPR、NH_3-TPD、N_2O滴定对催化剂结构进行表征,研究了SiO_2含量对催化剂结构及表面酸性的影响.结构表征表明助剂SiO_2的加入增加了催化剂的比表面积,提高了催化剂的还原性,使催化剂的表面酸性较为合适,同时在一定程度上能够抑制催化剂活性组分的聚集,从而有效促进了催化剂的催化活性.
CuO-ZnO with different content of SiO 2 was prepared by homogeneous precipitation as the active component of CO 2 hydrogenation to synthesize methanol. Then the mixture was homogeneously mixed with HZSM-5 molecular sieve to form bifunctional catalyst. The effects of different SiO 2 catalysts on CO 2 The catalysts were characterized by XRD, N2 isothermal adsorption and desorption, H_2-TPR, NH_3-TPD and N_2O titration. The effects of SiO_2 on the structure and surface acidity of the catalysts were investigated. The structural characterization indicates that the addition of SiO 2 increases the specific surface area of the catalyst, enhances the reducibility of the catalyst, makes the surface acidity of the catalyst more appropriate, and at the same time inhibits the aggregation of the active components of the catalyst to a certain extent, thereby effectively promoting the catalytic Catalytic activity.