Efficient synthesis of smaller crystal ZSM-5 zeolite in low TPAOH-to-silica ratio dry-gel hydrothermal system

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-03-10 DOI:10.1016/j.micromeso.2025.113596

Jiahui Hu, Hao Jiang, Yitong Guo, Jing Liu, Dan Xu, Guoxing Wu, Yanhui Yi, Zhongkui Zhao, Hongchen Guo

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Abstract

The present study is related to the synthesis of nano-sized ZSM-5 zeolite with a dry-gel hydrothermal (DHT) method which is different from the known dry-gel conversion (DGC) method, for it allows the crystallization of the dry-gel in water or n-butylamine solution and the use of common autoclaves. The effects of TPAOH/SiO₂ ratio on the crystal size of ZSM-5 zeolite product, and the viability of synthesizing nano-sized ZSM-5 zeolite using the new method from a TPAOH-poor dry-gel with the aid of co-template n-butylamine are emphasized. Results show that, under the same TPAOH/SiO₂ ratio conditions, DHT synthesis is more beneficial for obtaining smaller crystal size ZSM-5 zeolite than the conventional hydrothermal (CHT) synthesis. The DHT synthesis can be implemented with a TPAOH-rich dry-gel (for example, TPAOH/SiO₂≥0.15) by using simply water as crystallizing solution, to yield discrete nano-sized ZSM-5 zeolite (crystal size 70 nm), or with a TPAOH-poor dry-gel (for example, TPAOH/SiO₂ = 0.075) by using a concentrated NBA aqueous solution (for example, a solution contains 75 % NBA) as crystallizing solution, to yield aggregates of nano-sized ZSM-5 zeolite (primary particle size 200 nm). The nano-sized ZSM-5 zeolites synthesized by the DHT method are inclined to have larger mesoporous and macroporous volume. After being doped with zinc ions, they become promising catalysts for the aromatization of n-hexane (n-h).

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.