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用周期表中第V及IIB族元素的氧化物对NK-HZSM-5沸石(南开大学用无胺法合成的)进行改性,研究改性沸石上甲苯乙基化反应的催化性能,以及反应条件(如反应温度、载气流速、甲苯/乙烯原料配比等)对催化性能的影响,发现HZSM-5沸石经氧化物改性后,使甲苯乙基化反应的活性下降而对位选择性却明显上升,这可归因于添加氧化物改变了沸石的孔径和表面酸性,致使对位选择性增加。
The NK-HZSM-5 zeolite (synthesized by Nankai University without amine method) was oxidized with the oxides of Group V and Group IIB elements of the periodic table to study the catalytic performance of the toluene ethylation reaction on the modified zeolite, and the reaction Conditions (such as reaction temperature, carrier gas flow rate, toluene / ethylene ratio of raw materials, etc.) on the catalytic performance and found that HZSM-5 zeolite modified by oxide, the toluene ethylation reaction activity decreased bit selectivity But can be obviously increased. This is attributed to the fact that the addition of oxides changes the pore size and surface acidity of the zeolite, resulting in an increase in para-selectivity.