Synthesis of MCM-41/ZSM-5 composite molecular sieves with CTAB as template
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摘要: 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。Abstract: 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 X-ray 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.
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Key words:
- micro-mesoporous composite molecular sieve /
- MCM-41 /
- ZSM-5 /
- hydrothermal synthesis
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