Catalyst for synthesizing pyromellitic dianhydride through durene gas-phase oxidation as well as preparation method and application of catalyst
By using AFI structured molecular sieves and catalysts with V and Ti elements, the problem of low homogeneous anhydride yield in the prior art has been solved, achieving efficient homogeneous anhydride production. The catalyst has a stable structure and is suitable for the gas-phase oxidation synthesis of mesitylene.
CN120920059APending Publication Date: 2025-11-11CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information
- Application Number
- CN202410570221.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-11-11
AI Technical Summary
Technical Problem
Existing catalysts for the gas-phase oxidation of mesitylene to synthesize homohydric anhydride suffer from low homohydric anhydride yields, especially anatase TiO2 catalysts, whose performance is far below the theoretical yield.
Method used
A catalyst with high catalytic activity and stability was prepared by using molecular sieves containing AFI structure and catalysts with V and Ti elements through hydrothermal crystallization and calcination. The catalyst exhibits diffraction peaks of rutile TiO2 at a specific diffraction angle.
Benefits of technology
The yield of homogeneous anhydride was improved to 86.2%, and the catalyst structure was stable, making it suitable for the gas-phase oxidation synthesis of homogeneous tetramethylbenzene.
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Abstract
The invention relates to the field of catalysts, and discloses a catalyst for synthesizing pyromellitic dianhydride through durene gas-phase oxidation, the catalyst contains a molecular sieve with an AFI structure, a V element and a Ti element, and the XRD diffraction pattern of the catalyst has main diffraction characteristic peaks when 2 theta = 7.4, 12.9, 14.9, 19.8, 21.0, 22.4, 26.0, 27.4, 29.1, 30.1, 34.6, 36.1, 37.8, 39.2, 41.2, 44.1, 54.3, 56.6, 62.7, 64.0, 69.0 and 69.8. The preparation method of the catalyst comprises the steps that a vanadium source, a titanium source and raw materials used for synthesizing the molecular sieve of the AFI structure form a material to be subjected to hydrothermal crystallization, then hydrothermal crystallization and roasting are conducted, and the pH of the material to be subjected to hydrothermal crystallization is 1-4. The catalyst provided by the invention is especially suitable for oxidation synthesis of pyromellitic dianhydride from durene, and has high pyromellitic dianhydride yield. When the catalyst is used for synthesizing pyromellitic dianhydride through durene gas-phase oxidation, the yield of pyromellitic dianhydride can reach 86.2%, and a good technical effect is achieved.
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