Coated catalyst for methane oxygen-free aromatization and preparation method and application thereof
Through the combination of carburizing treatment and oxide coating, a core-shell type coating catalyst is formed, which solves the problem of metal-based molecular sieve catalyst migration and carbon deposits at high temperatures, and significantly improves the stability and reactivity of the catalyst.
CN119186633BActive Publication Date: 2025-03-18UNIV OF SCI & TECH OF CHINA
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Patent Information
- Application Number
- CN202411707253.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2044-11-27
AI Technical Summary
Technical Problem
Metal-based molecular sieve catalysts are prone to migration of metal species and formation of metal carbides and coke at high temperatures, resulting in pore blockage and loss of active sites, reducing the reaction performance and stability of the catalyst.
Method used
By carburizing the molecular sieve catalyst supported by metal oxide, a molecular sieve supported by metal carbide is formed, and an oxide coating layer is formed on its surface to form a core-shell type coating catalyst.
Benefits of technology
It effectively improves the stability of metal species in the molecular sieve pores, reduces carbon deposits, extends the service life of the catalyst, and significantly improves the anti-inactivation ability and reaction activity of the catalyst.
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Abstract
The present invention discloses a coated catalyst for methane oxygen-free aromatization, a preparation method and application thereof, comprising a core and a shell coated on the surface of the core; wherein the core is a molecular sieve loaded with metal carbides, and the shell is an oxide. The coated catalyst of the present invention forms active metal carbides in the core through carburization treatment to improve the stability of metal species in the molecular sieve pores, and forms a coating layer on the catalyst surface. The two methods cooperate to reduce carbon deposition, achieve effective control of metal species migration and carbon deposition inhibition, and improve the stability and reaction activity of the catalyst in long-term methane oxygen-free aromatization, which is of great significance.
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