MCM-56分子筛的静态合成及对苯与长链烯烃烷基化反应的催化性能

Static Synthesis of Zeolites MCM-56 and its Catalytic Performance in Alkylation of Benzene with Long-chain Alkenes

以六甲基亚胺为模板剂,静态水热晶化法合成了MCM-56分子筛,通过X-射线衍射、N2等温吸附等方法对样品进行表征。当硅铝比低于20时易生成MCM-49和丝光沸石,加入少量碱能提高分子筛的相对结晶度,最佳合成温度为135-150℃,时间分别为3天。考察了MCM-56对苯和长链烯烃烷基化反应的催化活性,并与MCM-22进行了对比。实验表明,在最佳反应温度120℃时,烯烃的转化率为29.35%,烷基苯（LAB）的选择性为98.22%,MCM-56的催化活性明显低于MCM-22。

MCM-56 zeolites with hexamethylenimine as organic template were synthesized by using hydrothermal static crystallzation method and were characterized by X-ray diffraction and N2 adsorption isotherms.The experiment indicated that MCM-49 and mordenite molecular sieve were produced when the molar ratio of SiO2/Al2O3 was below 20 and the crystallinity was enhanced with the addition of a small amount of NaOH.The optimal preparation temperature was 135-150 ℃,the reaction time was 3 days.The catalytic activity of MCM-56 was investigated and was compared with that of MCM-22 for the alkylation of benzene with long-chain alkenes.The experiments showed that the conversion of 1-dodecene was 29.35%,the selectivity of LAB was 98.22% while the optimal reaction temperature was 120 ℃ and the catalytic activity of MCM-56 was lower than that of MCM-22 for the alkylation of benzene with long-chain alkenes.