C8芳烃择形脱乙基催化剂的制备及评价

选用一种ZSM-5分子筛，采用适当的沸石外表面改性方法制备了一种C8芳烃择形脱乙基催化剂。该催化剂的适宜制备条件为：使用分子筛硅铝比为A的ZSM-5；以一种适当的含硅化合物对催化剂进行1次液相沉积改性；硅烷化焙烧过程中空气流速为（D+100～D+200）mL/min；金属铂负载量为E%。该催化剂能使进入沸石孔道的乙苯高效脱除乙基，同时具有抑制二甲苯歧化和烷基转移副反应的功能。在反应温度为400℃、反应压力为1.8 MPa、氢油摩尔比为1、空速为15 h-1的条件下，在所制备的C8芳烃择形脱乙基催化剂作用下，乙苯转化率达到90.19%、二甲苯收率达到98.81%。

STUDY OF SELECTIVE CATALYST FOR DEALKYLATION OF C8 AROMATICS

A catalyst using ZSM-5 zeolite as a component was developed to catalyze ethylbenzene dealkylation. Chemical liquid deposition (CLD) modification by silicon-containing compounds was performed to improve the catalyst pore dimensions in order to enhance the selectivity of dealkylation and reduce the disproportionation and transalkylation. The catalytic performance are tested in a fixed bed reactor under the reaction conditions of temperature 673-693K, hydrogen partial pressure of 1.8MPa, weight hourly space velocity of 10-15h-1, H2/feed molar ratio of 1-2, xylene yield could reach 98.81% and EB conversion is up to 90.19%.