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Strong Metal-Support Interaction-Induced Hydrogen Spillover Boosts Thermocatalytic Ammonia Decomposition
Zechang Chen1, Biao Jiang1, Zijie Lu1
1International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.
This study presents a novel Ni-Co catalyst on a proton-conducting support for efficient ammonia decomposition reaction (ADR). The catalyst achieves high conversion at lower temperatures, offering a promising alternative for industrial applications.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Efficient ammonia decomposition reaction (ADR) catalysts are crucial for industrial applications.
- Non-noble metal catalysts are sought after to reduce costs and improve sustainability.
- Proton-conducting ceramic supports offer unique advantages for catalytic reactions.
Purpose of the Study:
- To develop and evaluate a novel Ni-Co bimetallic thermocatalyst supported by BaCe0.8Y0.2O3-δ (BCY) for ammonia decomposition.
- To investigate the catalytic performance and stability of the Ni-Co/BCY system for ADR.
- To elucidate the synergistic effects and reaction mechanisms responsible for the enhanced catalytic activity.
Main Methods:
- Synthesis of Ni-Co bimetallic catalyst supported on BCY proton conductor.
- Characterization of catalyst structure, composition, and surface properties.
- Evaluation of catalytic activity and stability for ammonia decomposition under various conditions.
Main Results:
- Achieved 100% NH3 conversion at 550 °C and 95.1% at 520 °C (GHSV = 9000 mL h-1 gcat-1).
- Demonstrated outstanding stability under diverse operating conditions.
- Identified Ni-Co synergy, Ce basicity, and Y doping-induced oxygen vacancies as key factors for high activity.
Conclusions:
- The Ni-Co/BCY catalyst exhibits state-of-the-art performance for ammonia decomposition.
- Enhanced hydrogen spillover and metal-support interactions significantly boost ammonia activation.
- This catalyst represents a promising non-noble metal alternative for industrial ADR.
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