A surface aluminum-rich composite molecular sieve containing a ZSM-5 crystal phase and a synthesis method and application thereof

By preparing a surface-rich alumina composite molecular sieve containing the ZSM-5 crystalline phase and combining the advantages of molecular sieves with different topologies, the problem of molecular sieves being unable to efficiently increase the production of ethylene and propylene during catalytic cracking in existing technologies has been solved. This achieves high selectivity and high yield catalytic effects, making it suitable for industrial applications.

CN122355307APending Publication Date: 2026-07-10EAST CHINA NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EAST CHINA NORMAL UNIV
Filing Date
2026-04-16
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing molecular sieves are difficult to simultaneously achieve high activity and high selectivity in the production of ethylene (C2=) and propylene (C3=) during catalytic cracking processes, and the combination of molecular sieves with different topologies has not yet fully utilized their catalytic advantages.

Method used

By preparing surface-rich alumina composite molecular sieves containing ZSM-5 crystal phase, other molecular sieves with topological structures such as ZSM-11, ZSM-22, ZSM-23 and ZSM-35 are mixed with organic base or quaternary ammonium salt solutions and subjected to hydrothermal treatment to form composite molecular sieves, combining the catalytic activity and stability advantages of different topological structures.

Benefits of technology

It achieves synergistic and efficient catalytic action, significantly improves the selectivity and yield of ethylene and propylene, has good scalability, and the synthesis method is simple and controllable, making it suitable for industrial production.

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Abstract

This invention discloses a surface-rich aluminum composite molecular sieve containing ZSM-5 crystalline phase, its synthesis method, and its application. The aluminum distribution parameter (ADP) of the composite molecular sieve satisfies: 1.05 ≤ ADP ≤ 3.5, where ADP = (Si / Al(T)) / (Si / Al(S)), Si / Al(T) represents the overall Si / Al ratio of the composite molecular sieve determined by ICP method, and Si / Al(S) represents the Si / Al ratio of the composite molecular sieve surface determined by XPS method. The composite molecular sieve contains ZSM-5 and at least one of other topological molecular sieves, namely ZSM-11, ZSM-22, ZSM-23, and ZSM-35. This composite molecular sieve is prepared by mixing at least one of molecular sieves ZSM-11, ZSM-22, ZSM-23, and ZSM-35 as raw materials with a solution containing organic alkali and / or quaternary ammonium salts, followed by hydrothermal treatment. The composite molecular sieve with a surface rich in aluminum containing the ZSM-5 crystal phase obtained in this invention exhibits excellent catalytic activity and product selectivity in the catalytic cracking of olefins. It can be used in the process of catalytic cracking of mixed hydrocarbons (such as catalytic cracked gasoline) to produce low-carbon olefins such as ethylene and propylene.
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Citation Information

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