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Suppressing Metallic Co0 Formation in Co-Based Catalyst by In-Situ Selective H2 Oxidation for Efficient Ethane
Donghong Zhang1, Bingzhen Zhang1, Dong Liu1
1School of Power and Mechanical Engineering, Wuhan University, Wuhan, China.
Angewandte Chemie (International Ed. in English)
|April 11, 2026
Summary
This study introduces a new method using a cobalt catalyst paired with a cerium-bismuth oxide carrier to improve ethane dehydrogenation. This approach stabilizes the cobalt catalyst, significantly boosting ethylene production and catalyst longevity.
Area of Science:
- Catalysis
- Chemical Engineering
- Materials Science
Background:
- Cobalt catalysts show high activity for ethane dehydrogenation but deactivate due to reduction to metallic Co(0) in hydrogen-rich conditions.
- Coke deposition on metallic Co(0) leads to rapid catalyst deactivation, limiting ethylene production efficiency.
Purpose of the Study:
- To develop a tandem strategy for stabilizing cobalt catalysts during ethane dehydrogenation.
- To enhance ethylene selectivity and yield by suppressing cobalt reduction using a selective hydrogen oxidation system.
Main Methods:
- Integration of a CoOx/HZSM-5 (Co/HZ) dehydrogenation catalyst with a CeO2-promoted Bi2O3 (CeBiOx) oxygen carrier.
- Utilizing chemical looping oxidative dehydrogenation (CL-ODH) conditions to selectively oxidize in-situ generated hydrogen.
- Employing pulse reaction experiments, semi in-situ characterizations, and density functional theory (DFT) calculations for mechanistic insights.
Main Results:
- The CeBiOx carrier selectively oxidized over 75% of generated H2, effectively suppressing Co(0) formation.
- Achieved 40% ethane conversion and over 80% ethylene selectivity at 600°C.
- Demonstrated stable performance over 100 redox cycles, indicating enhanced catalyst durability.
Conclusions:
- The tandem strategy successfully stabilizes active cobalt species by preventing their reduction to Co(0).
- Selective hydrogen oxidation by CeBiOx mitigates coke formation and enhances ethylene yield.
- This approach offers a new paradigm for improving cobalt-based ethane dehydrogenation and intensifying ethylene production.
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