改性MCM-22分子筛催化长链烯烃对苯烷基化反应的研究  

MODIFICATION OF MCM-22 ZEOLITES AND ITS CATALYTIC PERFORMANCE IN ALKYLATION OF BENZENE WITH LONG-CHAIN ALKENES

作　　者：李工[1] 刘天华[1] 江林浪[1] 郑震涛[1] 佟惠娟[1] 

机构地区：[1]江苏工业学院化学工程系,江苏常州213164

出　　处：《精细石油化工》2007年第4期13-17,共5页Speciality Petrochemicals

基　　金：江苏省自然科学基金项目(BK2007043)

摘　　要：采用水热静态晶化法合成了MCM-22分子筛,考察不同原料配比对合成的影响,并用X射线衍射、N_2等温吸附和NH_3-TPD等方法对其进行了表征,并对MCM-22分子筛进行改性,考察其改性前后对苯和长链烯烃烷基化反应的催化活性。改性后催化剂Ni-JC-4(A)-0.001和JC-4(B1)对烯烃的转化率分别为94.84%和92.97%;对烷基苯的选择性分别为98.85%和99.02%,使用寿命分别达到27 h和37 h以上。实验表明,用1 mmol/L NiSO_4交换改性的催化剂和加入大孔Al_2O_3改性后的催化剂均具有较高的催化活性,使用寿命得到提高。MCM-22 zeolite was prepared by a hydrothermal crystallization method and the effect of the mole ratios of the reactants was investigated. The samples were characterized by X-ray diffraction, N2 adsorption and NH3-TPD. MCM-22 zeolite was modified by different methods and the catalytic performance of the modified and unmodified samples was investigated for the alkylation of benzene with 1-dodecene. Ni-JC-4（A）-0. 001 and JC-4（B1） showed higher activity than JC-4（A） for the alkylation reaction, with the conversion of 1-dodecene being 94.84% and 92.97%, the selectivity of LAB being 98.85% and 99.02%, and the life time being over 27 h and 37 h for the former and the later, respectively. The experimental results showed that the sample exchanged with 0. 001 mol/L NiSO4 and the one mixed with macroporous Al2O3 exhibited high catalytic activity and selectivity as well as long life time.

关 键 词：MCM-22分子筛 合成 改性 长链烯烃 苯的烷基化 

分 类 号：TQ426[化学工程]