采用水热合成法制备大晶粒ZSM-5分子筛。通过调节碱处理过程中碱种类和处理时间得到一系列多级孔ZSM-5催化剂，考察了催化剂在甲苯与甲醇择形烷基化反应中的催化性能，及不同孔结构对甲苯转化率和对二甲苯选择性的影响。结果表明，采用0.2 mol/L四丙基氢氧化铵（TPAOH）溶液在65℃处理30 min得到的催化剂的反应性能优于其他处理方法得到的ZSM-5催化剂。该催化剂在未经后续改性的前提下连续运转30 h，平均对二甲苯选择性为68.36%，甲苯转化率为11.24%，催化效果优于母体，但该催化剂的积炭量大大降低，稳定性更好。

Large grain ZSM-5 zeolite is prepared via hydrothermal method.A series of hierarchical porous ZSM-5 catalysts with large grains are obtained by adjusting alkali species and treatment time during alkali treatment.The catalysts are characterized by XRD,SEM,Ar-adsorption and thermogravimetry.Their catalytic performances are evaluated in the selective alkylation of toluene with methanol,and the effects of porous diameter of the catalysts on the conversion rate of toluene and the selectivity of p-xylene are studied.It is found the catalyst that has been treated by 0.2 mol·L^-1 of TPAOH solution with a liquid-solid ratio of 30 mL·g^-1 at 65℃ for 30 minutes performs the best performance.The average selectivity of p-xylene and the conversion rate of toluene can reach 68.36% and 11.24%,respectively over the optimal catalyst without modification in 30 h,while the carbon deposition rate is only 53% of the parent.

李洪坤(1993-),男,硕士研究生,研究方向为沸石分子筛的合成及其工业应用,lihk1993@foxmail.com