A kaolin-synthesized beta-zsm-12 composite molecular sieve, a preparation method and application thereof

By using kaolin as raw material and employing a two-step seeding method and precise process control, a Beta-ZSM-12 composite molecular sieve with high specific surface area, regular morphology, and stable framework was prepared, solving the problems of high cost and insufficient performance in traditional preparation methods, and realizing high-efficiency catalytic performance and industrial application.

CN122403471APending Publication Date: 2026-07-17NANCHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANCHANG UNIV
Filing Date
2026-04-02
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The preparation of Beta-ZSM-12 composite molecular sieves in the existing technology has problems such as high aluminum source cost, small specific surface area, irregular morphology, uneven particle size distribution, and poor stability of the skeleton structure, which limits its application in the petrochemical field.

Method used

Using kaolin as the sole aluminum source and part of the silicon source, a Beta-ZSM-12 composite molecular sieve with high specific surface area, regular morphology, well-organized pore structure, and excellent framework stability was prepared through a two-step seeding method and precise process control. The process included hydrothermal crystallization and calcination steps, using sodium hydroxide as the alkali source, tetraethylammonium hydroxide as the template agent, and silica sol as a supplementary silicon source, while controlling the crystallization temperature and time.

Benefits of technology

It significantly reduces raw material costs, increases specific surface area and catalytic performance, enhances the regularity of pore structure and framework stability, improves catalyst lifespan and reaction selectivity, and is suitable for industrial production.

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Abstract

The application discloses a kind of Beta-ZSM-12 composite molecular sieve synthesized by kaolin and a preparation method and application thereof, belong to molecular sieve catalyst technical field.The composite molecular sieve uses kaolin as only aluminum source and part of silicon source, particle size range is 300~3000nm, specific surface area is 600~1000m² / g, pore volume is 0.1~0.5cm³ / g, mesopore size is 2~10nm.Its preparation method includes: after kaolin is treated in alkali solution, Beta seed crystal is prepared by adding template agent and silicon source;Beta-ZSM-12 composite molecular sieve is prepared by kaolin, template agent, silicon source and Beta seed crystal as raw material, by hydrothermal crystallization, calcination and other steps.The composite molecular sieve can be applied to the product containing 2,6-dimethylnaphthalene generated by aromatic hydrocarbons alkylation reaction, and the product containing mesitylene generated by aromatic hydrocarbons isomerization reaction, with higher catalytic activity and selectivity.
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