分子筛的补铝及其催化性能研究

Study on realuminated zeolite and its catalytic performance

本文介绍了分子筛的补铝方法及其补铝后分子筛的催化性能。按所用的补铝溶液性质可分为 Na OH等碱性溶液补铝法、Al Cl3 和 HCl酸性溶液补铝法及含羟基有机酸溶液补铝法 ,补铝机理涉及晶格缺陷位补铝、非骨架位表面反应以及同晶取代三种。补铝的分子筛表面酸性质发生了变化 。

This paper reviews the advances in realumination of zeolites and their catalytic performance.According to the properties of realumination solution,realumination methods can be classified as that by basic solution such as NaOH,by acidic solution such as AlCl 3 and HCl,and by organic acid solution with hydroxyl group.The realumination mechanism can be sorted as(1)incorporation of aluminium atoms into defect sites;(2);non framework surface reaction of Si OH groups or non intact Si O Si bonds;and(3)isomorphous substitution of aluminium atoms for the framework silicon atoms.The property of surface acid of realuminated zeolite was changed and its property for some catalytic reactions improved.