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Published on: February 7, 2017
Methane dehydroaromatization over Mo-modified H-MFI for gas to liquid catalysts
Hirofumi Aritani1, Hiromi Shibasaki, Hitoshi Orihara
1Department of Applied Chemistry, Saitama Institute of Technology, Fukaya, Japan. aritani@sit.ac.jp
Journal of Environmental Sciences (China)
|October 7, 2009
Summary
A new process using molybdenum oxide on H-MFI zeolite efficiently converts methane to benzene. Hydrogen co-feeding enhances catalyst stability by reducing coking, revealing active molybdenum oxycarbide species.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Direct gas to liquid (GTL) processes require efficient methane dehydroaromatization.
- Methane to benzene conversion is a key step for producing valuable chemicals and fuels.
- Catalyst deactivation due to coking is a major challenge in methane conversion reactions.
Purpose of the Study:
- To develop a novel catalytic process for methane dehydroaromatization to benzene.
- To investigate the role of molybdenum oxide supported on H-MFI zeolite.
- To understand catalyst deactivation mechanisms and explore strategies for enhancing durability.
Main Methods:
- Methane dehydroaromatization reaction performed in a fixed bed reactor at 973 K.
- Characterization of catalysts using Mo K-edge X-ray absorption fine structure (XAFS) and Mo L(III)-edge XANES.
- Evaluation of catalyst performance with and without hydrogen co-feed.
Main Results:
- Supported MoO3 on H-MFI zeolite demonstrated high catalytic capacity and selectivity for methane to benzene conversion.
- Coke formation led to catalyst deactivation, which was suppressed by co-feeding hydrogen.
- XAFS and XANES analyses revealed the formation of dispersed Mo2C and active Mo-oxycarbide (MoOxCy) species.
Conclusions:
- Mo-oxycarbide species are identified as the highly active sites for methane dehydroaromatization.
- The stability of these Mo-oxycarbide species is crucial for durable catalytic activity.
- Hydrogen co-feeding improves catalyst longevity by mitigating coke deposition.
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