MFI type molecular sieve confinement precious metal Ru-based catalyst and preparation method and application thereof

Through the method of hydrothermal in situ ligand protection and step-by-step calcination of flowing air, the uniform distribution and stable encapsulation of Ru in MFI zeolites was successfully achieved, and the problem of easy migration and agglomeration of Ru under high temperature conditions in the prior art is solved. , improves the activity and thermal stability of the catalyst, and is suitable for the efficient deep oxidation of propane.

CN119281378AActive Publication Date: 2025-01-10XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202411410710.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-10
Publication Date
2025-01-10
Estimated Expiration
2044-10-10

AI Technical Summary

Technical Problem

The prior art is difficult to achieve uniform distribution and stable encapsulation of Ru in MFI-type zeolites under high temperature conditions, resulting in insufficient catalyst activity and stability, and it is difficult to effectively treat volatile organic compounds such as propane.

Method used

Using the strategy of hydrothermal in situ ligand protection and step-by-step calcination in flowing air, the Ru precursor is protected by ethylenediamine, inhibiting Ru's precipitation and migration, and avoiding cluster agglomeration through step-by-step calcination, realizing Ru's in MFI zeolite uniform dispersion and stable packaging in.

Benefits of technology

The stable encapsulation of Ru clusters in MFI zeolites has been achieved, which significantly improves the activity and thermal stability of the catalyst, can accelerate the deep oxidation of propane under low temperature conditions, and maintains the catalytic performance at high temperatures, extends the service life of the catalyst .

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Abstract

The invention discloses an MFI type molecular sieve confinement precious metal Ru-based catalyst and a preparation method and application thereof.The preparation method comprises the steps that a silicon source, a template agent and water are mixed and stirred till the silicon source is hydrolyzed, and a mixed solution is obtained; mixing a precursor and a ligand of Ru, adding the mixture into the mixed solution, and then carrying out hydrothermal reaction at 160-180 DEG C for 72-96 hours to obtain a solid sample; and calcining the solid sample in a flowing atmosphere step by step. The MFI type molecular sieve confinement Ru-based catalyst provided by the invention realizes effective stabilization of Ru which is easy to migrate and agglomerate. The catalyst is applied to propane oxidation reaction, and compared with a supported catalyst directly impregnated on the surface of the MFI molecular sieve, the catalyst has better low-temperature propane oxidation performance and shows excellent high-temperature thermal stability.
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Citation Information

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