中国石油大学学报（自然科学版）2018，Vol.42Issue(2)：153-159,7.DOI:10.3969/j.issn.1673-5005.2018.02.019
单一模板剂两段变温法合成球状多级孔ZSM-5分子筛
Two-step hydrothermal synthesis of hierarchical ZSM-5 zeolite with spherical structure using single template
摘要
Abstract
Hierarchical ZSM-5 zeolites with spherical structure were successfully synthesized via a facile two-step hydrothermal process at low temperature aging and high temperature crystallization period,in which the water glass or silicic acid were select-ed as silicon source and the tetrapropylammonium hydroxide (TPAOH) was used as the single template. The zeolites were characterized with XRD,FT-IR,N2adsorption-desorption isotherms,SEM and TEM,through which the formation mechanism of the hierarchical ZSM-5 zeolites with spherical structure was investigated. The results indicate that the hierarchical ZSM-5 ze-olite consists of regular spherical particles with around 2 μm in diameter and possesses intercrystalline meso-and macropores generated from the aggregation of bar-shape ZSM-5 nanocrystals. Compared with commercial ZSM-5 zeolite,the as-synthesized products with high relative crystallinity have larger BET specific surface area, mesopore surface area and mesopore volume.And the increasing amounts of the above three parameters for hierarchical ZSM-5 zeolites synthesized with silicic acid as silicon source are reached 114 m2/g,152 m2/g and 0.094 cm3/g,respectively. It is proposed that the aluminosilicate gel forms nano nuclei firstly with the induction effect of TPA+at the low temperature aging stage. Then,the crystal nucleus grew gradually to become nanocrystalline under the high temperature crystallization process. Finally,the aggregated nanocrystalline continues to grow up into bar-shape ZSM-5 nanocrystals and self-assemble into regular spherical structure.关键词
多级孔ZSM-5分子筛/两段变温法/单一模板剂/球状结构Key words
hierarchical ZSM-5 zeolites/two-step hydrothermal method/single template/spherical structure分类
化学化工引用本文复制引用
王有和,王晓东,孙洪满,任子豪,阎子峰,季生福..单一模板剂两段变温法合成球状多级孔ZSM-5分子筛[J].中国石油大学学报（自然科学版）,2018,42(2):153-159,7.基金项目
国家自然科学基金项目(21776311) （21776311）
中央高校基本科研业务费专项(15CX05030A) （15CX05030A）
应用表面与胶体化学教育部重点实验室开放课题基金项目(2017026) （2017026）
