Phosphorus-containing molecular sieve catalyst modified by fe and preparation method and application thereof

By preparing Fe-modified phosphorus-containing molecular sieve catalysts, the problems of low naphthalene conversion and poor 2,6-DIPN selectivity in the naphthalene alkylation reaction of existing catalysts were solved, achieving efficient naphthalene conversion and 2,6-diisopropylnaphthalene selectivity. The catalysts also exhibit good hydrothermal stability and environmental friendliness.

CN122164487APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing catalysts suffer from low naphthalene conversion and poor selectivity for 2,6-DIPN in the alkylation of naphthalene. In particular, anhydrous AlCl3 catalysts have harsh reaction conditions and are difficult to separate, while ionic liquid catalysts have low naphthalene conversion and high catalyst loss, and the acidic sites of molecular sieve catalysts lead to insufficient selectivity.

Method used

A method for preparing phosphorus-containing molecular sieve catalysts modified with Fe was proposed. Phosphorus-containing MCM-22 molecular sieves were synthesized hydrothermally in an amine-free system. The acidic sites on the outer surface of the molecular sieve were passivated by Fe oxides such as Fe2O3 to maintain catalyst activity and improve the selectivity of 2,6-DIPN.

Benefits of technology

It improves the conversion rate of naphthalene and the selectivity of 2,6-diisopropylnaphthalene, enhances the stability of the microporous structure of the molecular sieve, and makes the catalyst easy to regenerate and environmentally friendly.

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Abstract

This invention provides an Fe-modified phosphorus-containing molecular sieve catalyst, its preparation method, and its application, relating to the field of molecular sieve catalysts. The catalyst preparation method includes the following steps: Step 1: Obtaining a mixture containing an aluminum source, sodium hydroxide, water, and a phosphate ester, then mixing it with a silicon source, and then performing crystallization treatment to obtain a phosphorus-containing Na-type molecular sieve; Step 2: Ion-exchanging the phosphorus-containing Na-type molecular sieve obtained in Step 1 with an ammonium salt solution to obtain a phosphorus-containing MCM-22 molecular sieve; Step 3: Reacting a mixture of the phosphorus-containing MCM-22 molecular sieve obtained in Step 2 with an aqueous solution containing an Fe precursor to obtain the Fe-modified phosphorus-containing MCM-22 molecular sieve catalyst. The catalyst preparation method provided by this invention directly hydrothermally synthesizes the phosphorus-containing MCM-22 molecular sieve in an amine-free system. Fe modification of this molecular sieve improves the conversion rate of naphthalene and the selectivity of 2,6-diisopropylnaphthalene.
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