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摘要: 以正丁胺为模板剂，采用水热晶化法在固体硅胶小球上原位合成了ZSM-5分子筛。考察了晶化温度、晶化时间、初始凝胶硅铝比及H2O/ SiO2、BuNH2/ SiO2、OH-/SiO2对ZSM-5相对结晶度的影响，得到了ZSM5的合成化学规律。采用XRD、SEM、FTIR及N2吸附手段对固体硅胶小球上原位合成的复合结构分子筛进行了表征。结果表明，这种材料具有介孔和微孔的复合结构特征，而且很好地保持了硅胶小球的形貌。以大庆VGO为原料，在重油微反装置上对该复合结构分子筛进行催化性能评价。结果表明，使用硅胶原位合成的ZSM-5分子筛可显著提高低碳烯烃选择性和收率。Abstract: ZSM-5 was insitu synthesized on silica gel by using nbutylamine as the template and characterized by XRD, SEM, FTIR and N2 adsorption. The results indicated that the synthesized sample not only has a composite structure with ZSM-5 and silica gel, but retains the shape of silica gel microsphere. To obtain detailed information on the rules of synthesized chemistry, the effects of SiO2/Al2O3 of initial gel, H2O/SiO2, BuNH2/SiO2, OH-/SiO2, crystallization time and crystallization temperature on ZSM-5 crystallinity were systematically studied. The composite materials were tested in a micro fixedbed reactor, using Daqing Vacuum Gasoline Oil (VGO) as the feedstock. The results showed indicated that the composite structure zeolite yields more light olefins and has good selectivity to light olefins.
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Key words:
- composite molecular sieves /
- ZSM-5 /
- silica gel /
- insitu synthesis /
- light olefins
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