A method for preparing hierarchical porous zeolite by hydrophobic solvent-protected base etching

By using a hydrophobic solvent to protect the micropores of zeolite before alkaline etching to prevent micropore collapse, a hierarchical porous zeolite with high crystallinity and high mesoporous porosity was prepared. This solved the problem of micropore structure loss caused by alkaline etching in the prior art and realized the green and low-cost preparation of hierarchical porous zeolite.

CN122166795APending Publication Date: 2026-06-09NANKAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANKAI UNIV
Filing Date
2026-02-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing alkaline etching methods are prone to microporous structure collapse and acid loss when preparing hierarchical porous zeolites. Furthermore, their reliance on organic amines increases costs and pollution, making it difficult to achieve green and low-cost preparation with high crystallinity and high mesoporous porosity.

Method used

Hydrophobic solvents are used to protect the micropores of zeolite before alkaline etching. Hydrophobic solvents such as acetophenone enter the micropores of zeolite to avoid excessive attack by OH-, thereby achieving directional desilication and pore formation and preventing micropore collapse. Multi-level porous zeolite is prepared by alkaline etching with sodium hydroxide followed by calcination.

Benefits of technology

It maintains the high crystallinity and microporous structure of zeolite, generates abundant mesopores and macropores, and has adjustable acidity, providing a green and low-cost method for preparing hierarchical porous zeolite, suitable for industrial applications.

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Abstract

The present application relates to a kind of hydrophobic solvent protection alkali etching preparation method of hierarchical pore zeolite.The steps are to disperse zeolite raw powder in water, then add hydrophobic solvent, stirring to obtain zeolite dispersion;In the above zeolite dispersion, sodium hydroxide is added to carry out alkali etching, and the product is centrifuged, washed and dried.Using hydrophobic organic solvent with solubility in water <50 g / L, micropore protection is realized.Using hydrophobic solvent assisted alkali etching to prepare hierarchical pore zeolite, the hydrophobic solvent has affinity with the hydrophobic channel of high-silicon zeolite, can spontaneously enter the zeolite micropore, and protect the zeolite micropore channel during alkali etching, avoid the collapse of zeolite micropore channel structure, can keep the zeolite with relatively high crystallinity, with controllable acidity.The present application gets rid of the direct alkali etching which can cause the decrease of zeolite crystallinity and the dependence on nitrogen-containing organic matter, is a green low-cost process, and provides a universal solution for the industrial application of hierarchical pore zeolite.
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