由于水蒸气处理HZSM-5生成的骨架外铝在分子筛中体现Lewis酸性,分子筛中骨架外铝物种的可移动性导致Lewis酸与分子筛本身的Br(o)nsted酸在空间上具有临近性.当甲基环己烷分子在HZSM-5的笼中转化时,Lewis酸与Br(o)nsted酸的协同作用加快了甲基环己烷分子的转化速率,且骨架外铝物种浓度越高,这种协同效应越明显.而产物的选择性只与催化剂的孔道结构有关,与水蒸气处理所导致的酸性质的变化无关.
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