Aluminum-modified mcm-41 mesoporous molecular sieve catalyst, its preparation method and application

By modifying MCM-41 molecular sieves with aluminum nitrate ethanol solution impregnation, the loading of aluminum species and acidity distribution were controlled, solving the problems of weak acidity and easy destruction of pore structure of MCM-41 catalyst, and achieving high-efficiency catalytic performance for the reaction of monoisopropylnaphthalene with propylene.

CN122230780APending Publication Date: 2026-06-19CHANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU UNIV
Filing Date
2026-03-23
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing MCM-41 molecular sieve catalysts are weakly acidic, and traditional modification methods easily damage the pore structure, making it difficult to achieve high conversion and high selectivity for the reaction of monoisopropylnaphthalene with propylene while maintaining the integrity of the mesoporous structure.

Method used

MCM-41 was modified by impregnation with aluminum nitrate ethanol solution. The concentration of aluminum nitrate solution was controlled in the range of 0.50~1.25 mol/L. Aluminum-modified MCM-41 catalyst was prepared by calcination, which maintained the mesoporous structure while constructing suitable medium- and strong acid sites.

Benefits of technology

It achieves high conversion (84.3%) and high selectivity (55.4%) of diisopropylnaphthalene in the alkylation reaction of monoisopropylnaphthalene and propylene, avoiding the environmental pollution of traditional liquid acid catalysts and having good potential for reuse.

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Abstract

This invention discloses an aluminum-modified MCM-41 mesoporous molecular sieve catalyst, its preparation method, and its application, belonging to the field of chemical catalyst technology. The preparation method uses aluminum nitrate as the aluminum source and ethanol as the solvent, employing concentration-controlled impregnation to modify the MCM-41 molecular sieve. By adjusting the concentration of the aluminum nitrate solution, aluminum species are introduced while maintaining the stability of the MCM-41 mesoporous framework structure, thereby controlling the distribution of acidic sites. This results in a modified molecular sieve catalyst with suitable medium-to-strong acid sites and regular mesoporous channels, exhibiting excellent catalytic performance in the alkylation reaction of monoisopropylnaphthalene and propylene to synthesize diisopropylnaphthalene. Furthermore, the catalyst preparation method is simple, the catalytic process is environmentally friendly, and it has good prospects for industrial application.
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