WO_3负载的金属催化剂催化性能研究

通过共沉淀法制备了一系列WO3负载的金属催化剂,以甲醇低温裂解、苯加氢和甲苯加氢为探针反应,考察了其催化性能。实验发现对甲醇低温裂解反应,WO3负载的金属催化剂没有提高金属催化剂的催化活性,载体WO3对甲醇低温裂解反应没有促进作用;而对苯和甲苯加氢反应,WO3负载的金属催化剂的活性却大大提高,载体WO3对苯和甲苯发生加氢反应有明显的促进作用。这是由于吸附在不饱和W中心上的苯和甲苯,与金属活性中心活化的溢流氢发生反应,分别生成环己烷和甲基环己烷。

Study on Catalytic Property of WO3 Supported Metal Catalysts

A series of metal catalysts supported on WO3 prepared via co-precipitation have been investigated for methanol decomposition and hydrogenation of benzene and toluene reaction. Metal catalysts supported on WO3 prepared via co-precipitation don't increase the conversion of methanol decomposition reaction in contrast to metal catalysts without WO3 via co-precipitation. While the conversion of benzene and toluene increase remarkably for metal catalysts supported on WO3 prepared via co-precipitation. The additional activity could be ascribed to the unsaturated tungsten sites, where the activated hydrogen spilt over from the neighboring metallic sites could hydrogenate the adsorbed benzene and toluene with the formation of cyclohexane and methylcyclohexane, respectively.