Hydrothermal Synthesis of ZSM⁃5 Induced by Corresponding Alkaline Hydrolysis Products

doi:10.12422/j.issn.1672-6952.2025.02.003

Abstract

Abstract:

ZSM?5 has been widely used in the field of petrochemical industry. The extensive use of organic templates in its conventional synthesis process has caused serious problems on environmental and cost. In this paper, the hydrothermal synthesis of ZSM?5 with tetraethyl orthosilicate, aluminum sulfate octadecahydrate and alkaline hydrolysis product of HZSM?5 as silica source, alumina source and structural directing agent, respectively, has been investigated, which aims at developing of new process for green synthesis of zeolites. The synthesized samples were characterized by a series of techniques, such as XRD, TEM, SEM, N₂ physical adsorption and TG analysis. It has been shown that successful synthesis of ZSM?5 can be achieved by induction of alkaline hydrolysis product of HZSM?5 in organic template?free system. The prepared sample possesses a relative low crystallinity and specific surface area than ones from conventional process. The study in this paper has provided the chance for combination of green synthesis of zeolites and post?treatment route for synthesis of hierarchical zeolites.

Key words: ZSM?5, Green synthesis, Alkaline hydrolysis product, Organic template?free, Hierarchical

摘要：

ZSM?5分子筛在石油化工领域有广泛的应用，但是其传统合成方法使用大量的有机模板剂，因此造成严重的环境和成本问题。以硅酸四乙酯为硅源、十八水合硫酸铝为铝源，以成品HZSM?5分子筛的碱溶解液代替有机模板剂，对ZSM?5分子筛的水热合成过程进行了研究；采用XRD、TEM、SEM、氮气物理吸附、热重分析等手段对合成的分子筛进行了表征。结果表明，在无有机模板剂的条件下，成品HZSM?5分子筛的碱溶解液可以成功诱导合成ZSM?5分子筛；ZSM?5分子筛的结晶度和比表面积比传统方法合成的样品低。该研究实现了分子筛绿色合成工艺以及多级孔分子筛后处理合成工艺的有机结合。

关键词: ZSM?5, 绿色合成, 碱溶解液, 无有机模板剂, 多级孔

CLC Number:

O643.36

Wenqi XU, Yifan LIU, Jiaxin MA, Rui WANG, Heng JIANG, Changzi JIN. Hydrothermal Synthesis of ZSM⁃5 Induced by Corresponding Alkaline Hydrolysis Products[J]. Journal of Liaoning Petrochemical University, 2025, 45(2): 21-27.

徐文琦, 刘一帆, 马加新, 王锐, 姜恒, 金长子. 沸石碱溶解液诱导ZSM⁃5分子筛水热合成研究[J]. 辽宁石油化工大学学报, 2025, 45(2): 21-27.

Figures/Tables 8

Fig.1 Schematic diagram of combination of preparation for hierarchical zeolite and green synthesis of zeolite

Fig.2 XRD patterns of samples synthesized with different SiO2(ZSM?5)/SiO2(TEOS) molar ratio

Fig.3 XRD patterns of samples synthesized under different SiO2/Al2O3 molar ratio

Fig.4 XRD patterns of samples synthesized with silica sol as silica source

Fig.5 TG curve and N2 physical adosorption/desorption isotherm of ZSM?5 synthesized with induction of corresponding alkaline hydrolysis products

Fig.6 TEM and SEM images of ZSM?5 synthesized with induction of corresponding alkaline hydrolysis products

Fig.7 XRD pattern and SEM image of alkali?treated ZSM?5

Fig.8 N2 physical adosorption/desorption isotherm and pore size distribution of alkali?treated ZSM?5

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