纳米和微米ZSM-5分子筛在焦化苯乙基化反应体系中稳定性比较

摘要

以焦化苯乙基化合成乙苯为探针反应,研究了具有相同硅/铝比、不同晶粒尺寸的ZSM-5分子筛的催化性能.结果表明,纳米和微米ZSM-5分子筛稳定性差异与烷基化试剂种类密切相关.在焦化苯与乙醇的反应体系中,以微米ZSM-5分子筛为母体所得到的ZSM-5-m-25的稳定性较好；在焦化苯与乙烯的反应体系中,以纳米ZSM-5分子筛为母体所得到的ZSM-5-n-25分子筛的稳定性较好.%The ethylation of coking benzene over ZSM-5 zeolites with different crystal size was investigated. The results showed that the difference in catalyst stability of nano-sized and micro-sized ZSM-5 zeolites in ethylation depended strongly on the type of ethylation agent. When ethanol was used as the ethylating agent, ZSM-5-m-25 prepared from micro-sized ZSM-5 zeolite exhibited better catalysis stability than ZSM-5-n-25 prepared from nano-sized ZSM-5 zeolite. When ethyene was used as the ethylating agent, ZSM-5-n-25 showed better catalyst stability than ZSM-5-m-25.