Sr-ZSM-5/SBA-15复合分子筛的制备

采用浸渍法对ZSM 5进行金属Sr改性，通过后合成法制备了Sr ZSM 5 SBA 15复合分子筛。采用XRD、N2吸附 脱附、FT IR、Py FTIR等技术对样品进行表征，并以其催化甲苯甲醇烷基化反应，考察了Sr负载量、晶化时间、盐酸用量和焙烧温度对Sr ZSM 5 SBA 15催化烷基化性能的影响。结果表明，最佳的Sr ZSM 5 SBA 15制备条件为，Sr负载量3%(质量分数)、晶化时间20 h、盐酸用量40 mL、焙烧温度550℃；该条件下制备的Sr ZSM 5 SBA 15仍具有微 介孔复合结构，催化甲苯甲醇烷基化反应的甲苯转化率为3015%，对二甲苯选择性为7741%。

Preparation of Sr-ZSM-5-SBA-15 Composite Molecular Sieves

ZSM 5 was modified with metal Sr by impregnation method, and then the micro mesoporous composite molecular sieve of Sr ZSM 5 SBA 15 was synthesized by post synthesis. The prepared samples were characterized by means of XRD, N2 adsorption desorption, FT IR, and Py FTIR, and their catalytic performance in alkylation reaction of toluene with methanol was evaluated. The influences of the Sr loading amounts, crystallization time, acid content, and calcination temperature on alkylation reaction of toluene were investigated. The results suggested that the optimal preparation conditions were Sr loading amount of 3%, crystallization time of 20 h, acid content of 40 mL and calcination temperature of 550℃, under which the prepared Sr ZSM 5 SBA 15 had micro mesoporous structure, and used as catalyst of toluene alkylation reaction, the toluene conversion rate of 3015% and the p xylene selectivity of 7741% could be obtained.