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在晶化釜内动态水热合成了MCM-56分子筛,采用过氧化氢回流处理方法脱除模板剂,获得了高比表面积分子筛MCM-56[MCM-56(H2O2)].采用XRD,N2气吸附-脱附,NH3-TPD和FTIR等对其结构和酸性进行表征,考察了HMCM-56(H2O2)分子筛在苯与丙烯液相烷基化合成异丙苯中的催化性能.研究结果表明,过氧化氢回流处理能够有效去除模板剂.与焙烧去除模板剂的HMCM-56(C)相比,HMCM-56(H2O2)分子筛的BET比表面积达到563m2/g,外表面积提高近2倍.酸性表征说明,与HMCM-56(C)相比,HMCM-56(H2O2)的总酸量较高而酸强度分布不变.在苯与丙烯液相烷基化反应中,HMCM-56(H2O2)分子筛表现出更好的低温活性和更高的异丙苯选择性.
MCM-56 [MCM-56 (H2O2)] was obtained by hydrothermal synthesis of MCM-56 molecular sieve in a crystallization reactor and removal of templating agent by hydrogen peroxide treatment. Adsorption-desorption, NH3-TPD and FTIR were used to characterize their structure and acidity. The catalytic performance of HMCM-56 (H2O2) molecular sieve in the liquid phase alkylation of benzene with propylene to cumene was investigated. HMCM-56 (H2O2) molecular sieve has a BET specific surface area of 563m2 / g and an approximate 2-fold increase in external surface area compared with HMCM-56 (C) Characterization indicates that the total acidity of HMCM-56 (H2O2) is higher than that of HMCM-56 (C) while the acid strength distribution is not changed.In the liquid phase alkylation of benzene and propylene, the content of HMCM-56 Molecular sieves showed better low temperature activity and higher cumene selectivity.