针对苯与乙醇烷基化制备乙苯的反应，选用纳米聚集体HZSM-5分子筛为母体催化剂，采用固定床反应器考察了反应条件对催化性能的影响，筛选出最优反应条件，并评价了母体催化剂的稳定性；探究了Zn、Mg、P单组分改性以及Zn和Mg、P和Mg复合改性催化剂对反应性能的影响。结果表明，在苯/醇摩尔比为6、空速为6 h^-1、反应温度为350℃、载气流量为30 mL/minČ的条件下，催化剂连续反应300 h苯转化率保持在15%以上，乙苯选择性和乙基产物的选择性分别保持在96.3%和98.8%左右，但二甲苯的质量分数偏高，保持在490 μg/g以上。母体催化剂经单组分改性后，苯-乙醇烷基化的副产物二甲苯质量分数均得到降低，经P和Mg复合改性具有更好的效果，苯转化率和乙基选择性分别为15.4%和99.6%，二甲苯质量分数可降低至241 μg/g。

In the light of the alkylation between benzene and ethanol to ethylbenzene, nano-aggregated ZSM-5 zeolite is selected as parent catalyst to evaluate the impact of reaction conditions on catalytic performance in a fixed-bed reactor.The optimal reaction conditions are screened out, over which the stability of the parent catalyst is evaluated under these conditions.The reaction performances of the parent catalyst modified by single component (Zn, Mg, P) and bicomponent (Zn+Mg, P+Mg) are studied.It is indicated by the results that the conversion of benzene remains above 15%, and the selectivity of ethylbenzene and ethyl maintain at 96.3% and 98.8%, respectively when the benzene/alcohol molar ratio is 6, space velocity is 6 h^-1, reaction temperature is 350℃, carrier gas flow rate is 30 mL·min^-1, and the reaction has continuously performed for 300 h.But the content of xylene in the alkylation products stays at the high side that remains above 490 ppm.As the parent catalyst modified by single component is served, the content of xylene in the alkylation products drops.In addition, the bicomponent modification by P+Mg gives better effect, over which the benzene conversion and ethyl selectivity are 15.4% and 99.6%, respectively while the content of xylene in the products decreases to 241 ppm.

吕晓欢(1997-),女,硕士生,研究方向为分子筛催化,lv＿xiaohuan1997@163.com。