负载型CuO/TiO_2催化剂催化CO_2加氢制甲醇

Methanol Synthesis from CO_2 Hydrogenation over Supported CuO/TiO_2 Catalysts

采用浸渍法制备了CuO/TiO_2负载型催化剂,并将其用于CO2加氢制甲醇反应。重点考察了铜的负载量对催化剂性能的影响,并对其物化性能和催化性能之间的关系进行了讨论。结果发现,随着铜负载量的增加,催化剂中金属铜的比表面先增加后减小,当铜的负载量为10%(质量百分数)时达到最大值。催化剂的表面碱性位数量随铜含量的增加持续减小,中等碱位和强碱位的强度下降。当铜的负载量不高于10%时,CO2的转化率与铜的比表面积呈线性关系。甲醇选择性与催化剂的表面碱位性质有关,过强的碱性位会降低甲醇选择性。

CuO/TiO2 catalysts were prepared by the impregnation method and used for methanol synthesis from CO2 hydrogenation. The influences of Cu loading amount on the properties of CuO/TiO2 were investigated, and the relationship between the physicochemical and catalytic properties was discussed. The results show that the copper surface area increases first and then decreases with increasing Cu loading amount, and a maximum is obtained as Cu loading amount is 10% （w/w）. Moreover, with the increase in Cu loading, the amount of basic sites decreases continuously accompanied by a decline in the strength of the medium and strong basic sites. For catalysts with Cu loading of no more than 10%, the CO2 conversion increase linearly with the increase in the copper surface area. The methanol selectivity is related to the surface basicity, and an excessive basicity leads to a decrease in methanol selectivity.