多级孔ZSM-5纳米晶团聚体分子筛的合成与优化研究
Synthesis and optimization of ZSM-5 nanocrystallite aggregates with hierarchical pores
邹杨杨 1朱鹏 1吕晓欢 1聂海伟 1刘海鸥 1张雄福 1刘国东2
作者信息
- 1. 大连理工大学化工学院化学工艺系,辽宁 大连 116024
- 2. 中国科学院大连化学物理研究所,催化基础国家重点实验室,辽宁 大连 116023
- 折叠
摘要
采用纳米粒子自组装策略,选择传统微孔模板剂四丙基氢氧化铵(TPAOH)为单一模板剂和廉价的硅溶胶为硅源,合成了多级孔ZSM-5 纳米晶团聚体分子筛.考察了硅铝摩尔比和体系Na+摩尔分数对纳米晶团聚体ZSM-5 分子筛形貌的影响,并追踪了不同晶化时间下纳米晶团聚体的形成过程,最后利用XRD、SEM和氮气吸附/脱附等表征手段对所合成分子筛的性质进行分析.结果表明,低硅铝摩尔比有利于纳米晶团聚体分子筛的形成,同时合成体系中的Na+对团聚体的形成具有重要作用.经优化调控后,小试可合成固体收率达94.2%的ZSM-5 纳米晶团聚体分子筛,经 3L合成釜进行 40 倍的放大合成可成功获得高结晶度、高产率的产品.
Abstract
ZSM-5 nanocrystalline aggregates zeolites with hierarchical pores are synthesized by means of the nanoparticles self-assembly strategy,using tetrapropyl ammonium hydroxide(TPAOH)as the single template and cheap silica sol as silicon source.The effects of SiO2/Al2 O3 ratio and the contents of Na+on the morphology of ZSM-5nanocrystalline aggregates zeolites are investigated.The formation process of nanocrystalline aggregates is tracked at different crystallization times.The properties of the synthesized molecular sieve are analyzed by means of XRD,SEM,nitrogen adsorption/desorption and other characterization measurements.The results show that the lower SiO2/Al2O3 ratio is conducive to the formation of molecular sieve of nanocrystalline aggregates,and Na+in the synthetic system plays an important role in the formation of the aggregates.After the optimization and regulation,ZSM-5 nanocrystalline aggregates with a solid yield of 94.2％can be synthesized in the pilot test.The product with high crystallinity and high yield can be successfully synthesized by a 3-L synthesis reactor with a 40-fold amplification.
关键词
ZSM-5分子筛/多级孔分子筛/纳米团聚体/分子筛合成Key words
ZSM-5 molecular sieve/hierarchical molecular sieve/nano aggregates/molecular sieve synthesis引用本文复制引用
基金项目
大连理工大学-大连化物所合作项目(HX20230236)
出版年
2024
NETL
NSTL
万方数据