以十六烷基三甲基溴化铵为模板剂合成MCM-41/ZSM-5复合分子筛的研究

Synthesis of MCM-41/ZSM-5 composite molecular sieves with CTAB as template

采用阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为模板剂、以ZSM-5为晶种,在水热晶化条件下合成了同时具有微孔和介孔的MCM-41/ZSM-5复合分子筛;并考察了陈化温度、陈化时间、晶化时间及模板剂用量等条件对合成复合分子筛的影响。通过X射线衍射、扫描电镜、高分辨率透射电镜、红外光谱及N2静态吸附法等手段对合成样品进行表征,并与机械混合样品以及纯的ZSM-5和MCMC-41进行比较。结果表明,所合成的样品同时具备微孔ZSM-5和介孔MCM-41结构且在结构上不同于机械混合样品。

This article describes the synthesis and characterization of a novel MCM-41/ZSM-5 composite molecular sieve. The composite was synthesized under hydrothermal conditions by use of cetyltrimethylammonium bromide as the template and characterized by Xray diffraction （XRD）, scanning electron microscope （ SEM ）, transmission electron microscopy （ TEM ）, infrared spectroscopy and N2-sdsorption, respectively. The results indicated that the sample was a composite molecular sieve which was different from ZSM-5 zeolite and MCM-41 sieve. The influence of the synthesis parameters was discussed. It was shown that the gelation time, aged temperature and the quantity of CTAB played an important role in the synthesis.