以Si,P,Mg复合改性的纳米HZSM-5为催化剂,进行了甲苯与甲醇的烷基化反应;并采用X射线衍射,NH3程序升温脱附,红外和低温N2吸附等方法研究了改性前后催化剂酸性质和孔结构的变化.在小型固定床反应器上,考察了载气量、反应温度和重时空速等反应条件对烷基化反应性能的影响.在2h-1,460℃,甲苯/甲醇比,水/烃比和N2/烃摩尔比均为8的优化条件下,单程连续运转500h,甲苯转化率可维持在10%左右,对二甲苯选择性高于97%,催化剂表现出良好的稳定性.
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