两段晶化法快速合成均匀单分散小晶粒ZSM-5分子筛  

Rapid synthesis of ZSM-5 zeolite with small-sized and single dispersed crystals by two-stage crystallzation

作　　者：卢永斌 张媛 刘志玲 张菊 张伟 李思[2] 张雄福[2] LU Yong-bin ZHANG Yuan LIU Zhi-lin ZHANG Ju ZHANG Wei LI Si ZHANG Xiong-fu(Research Institute of Shaanxi Yanchang Petroleum Company Ltd., Xi＇an 710075, China State Key Laboratory of Fine Chemicals, School of Chemical Enginerring, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [2]大连理工大学化工学院精细化工国家重点实验室,大连116024

出　　处：《天然气化工—C1化学与化工》2017年第3期1-6,共6页Natural Gas Chemical Industry

基　　金：陕西延长石油(集团)有限责任公司<308科研攻关项目研究>(ycsy2013ky-A-15)

摘　　要：在无添加任何其它组分条件下,采用简单两段晶化合成法制备出具有均匀单分散小晶粒ZSM-5分子筛。通过采用X射线粉末衍射(XRD)、扫描电镜(SEM)对合成结果进行分析可知,合成的分子筛是典型的ZSM-5结构分子筛,晶粒十分均匀而呈单分散,粒度大小约为200~300nm。考察了预晶化温度和时间、晶化生长温度和时间、合成碱度和硅铝比等对快速合成小晶粒ZSM-5分子筛的影响。结果表明,在相对高碱度和较低预晶化温度条件下有利于快速(总共4~6h)合成高质量小晶粒ZSM-5分子筛。Small-sized and single dispersed ZSM-5 crystals with an average size of 250 nm were rapidly prepared by a method of two-stage synthesis without any additive added in the synthesis solution. The as-synthesized products were characterized by SEM and XRD. The results showed that the obtained products had pure ZSM-5 structure proved by the XRD pattern and the crystals were typical benzene-ring shape observed by the SEM image. The zeolite crystals were extremely uniform and regular without any impurity. The effect of some main factors including the pre-crystallization temperature and time, crystallization temperature and time, SiO2/ Al2O3 mole ratio and synthesis alkalinity on the rapid formation of small-sized and single-dispersed ZSM-5 crystals was also investigated and discussed. Resuhs indicated that lower pre-crystallization temperature and higher synthesis alkalinity are beneficial to the rapid formation of small-sized and single-dispersed ZSM-5 crystals.

关 键 词：沸石 ZSM-5 小晶粒 制备 两步结晶 

分 类 号：TQ424.25[化学工程]