蒸汽相转化法原位诱导沸石化制备Y-ZSM-5双沸石复合物

发布时间：2018-04-15 18:21

本文选题：沸石 + 复合物　；参考：《无机化学学报》2017年07期

【摘要】：针对Y型沸石在ZSM-5沸石干胶制备及晶化过程中易于溶解、坍塌的问题,采用葡萄糖在水热处理条件下对Y沸石进行包膜处理,提高了Y沸石在高温、高碱度环境中的稳定性,并采用蒸汽相转化法制备了同时含有Y和ZSM-5的双沸石复合物。对影响沸石复合物形成的因素如Y沸石表面碳包膜改性、凝胶碱度、晶化时间等进行了详细讨论。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅立叶变换红外(FT-IR)、N2吸附-脱附,能谱(EDS)以及NH3-TPD等手段对制备的材料进行了表征。结果表明通过蒸汽相转化法能获得Y和ZSM-5两相共存的双沸石复合物,产物中的ZSM-5沸石相前驱体随蒸汽处理时间的延长逐渐从蠕虫状无定型向纳米多晶ZSM-5沸石转变,纳米多晶聚集体与Y型沸石晶粒之间紧密相连,相互包埋。在异丙苯催化裂化反应中,合成的沸石复合物的活性和稳定性介于Y和ZSM-5之间,优于对应的机械混合物。
[Abstract]:In view of the problem that Y zeolite is easy to dissolve and collapse during the preparation and crystallization of ZSM-5 zeolite, the stability of Y zeolite in high temperature and high alkalinity environment can be improved by coating Y zeolite with glucose under hydrothermal treatment.The bimolites containing Y and ZSM-5 were prepared by vapor phase inversion method.The factors affecting the formation of zeolite complex, such as carbon coating modification, gel alkalinity and crystallization time, were discussed in detail.The prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) FT-IRN _ 2 adsorption-desorption, EDS and NH3-TPD.The results show that the existence of Y and ZSM-5 can be obtained by vapor phase inversion method. The precursor of ZSM-5 zeolite in the product changes gradually from wormlike amorphous to nanocrystalline ZSM-5 zeolite with the prolongation of steam treatment time.Nanocrystalline aggregates are closely connected with Y-type zeolite grains and embedded in each other.In the catalytic cracking reaction of cumene, the activity and stability of the synthesized zeolite complex are between Y and ZSM-5, which is superior to the corresponding mechanical mixture.
【作者单位】：太原理工大学能源化工与催化研究中心;抚顺石油化工研究院;
【基金】：国家自然科学基金委-中石化联合基金重点支持项目(No.U1463209) 国家自然科学基金(No.21371129;21376157) 中国石油化工股份有限公司项目(No.116050)资助
【分类号】：TE624.9

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