Preparation method and application of naphthalene alkylation catalyst based on hierarchical pore molecular sieve

By preparing a hierarchical porous molecular sieve catalyst, the problems of easy catalyst deactivation and low shape selectivity in the naphthalene alkylation reaction were solved, and the production of 2,6-diisopropylnaphthalene with high conversion rate and selectivity was achieved.

CN122273564APending Publication Date: 2026-06-26ZHEJIANG DONGJIANG GREEN PETROCHEMICAL TECHNOLOGY INNOVATION CENTER CO LTD
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Patent Information

Application Number
CN202610182252.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-09
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, catalysts for naphthalene alkylation reactions are prone to deactivation and have low shape selectivity, resulting in low selectivity and production efficiency for 2,6-diisopropylnaphthalene.

Method used

A hierarchical porous molecular sieve catalyst preparation method is adopted. The dealuminolite molecular sieve is treated with steam or acid washing to form microporous and mesoporous structures. The outer silica-rich shell is formed by treatment with tetraethylammonium hydroxide and alkali. Combined with ammonium ion exchange modification, a hierarchical porous catalyst with inner microporous and mesoporous structures is prepared.

Benefits of technology

It improves the conversion rate and selectivity of the catalyst, enhances its resistance to carbon deposition, has high mass transfer efficiency, is not easily deactivated, and is suitable for the preparation of 2,6-diisopropylnaphthalene by naphthalene alkylation reaction.

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Abstract

The invention relates to the field of catalysis, and discloses a preparation method and application of a naphthalene alkylation catalyst based on a hierarchical pore molecular sieve. The preparation method comprises the following steps: 1) performing steam treatment or pickling treatment on a low-silica-alumina-ratio zeolite molecular sieve with a microporous structure to obtain a dealuminated molecular sieve; 2) treating the dealumination molecular sieve with a mixed aqueous solution of tetraethylammonium hydroxide and alkali to obtain a hierarchical pore molecular sieve with a silicon-rich surface; and 3) carrying out ammonium ion exchange modification and roasting on the surface-silicon-rich hierarchical pore molecular sieve to obtain the alkylation catalyst, of which the inner layer has a hierarchical pore structure of micropores and mesopores and the outer layer is inert silicon dioxide mainly comprising mesopores. The inner layer of the prepared naphthalene alkylation catalyst has a hierarchical pore structure of micropores and mesopores, the outer layer is inert silicon dioxide mainly containing mesopores, and the catalyst has the advantages of being high in selectivity, good in mass transfer efficiency and not prone to inactivation.
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