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Carbon and Oxygen Double Defects-Enhanced Ru-Based Catalyst for Ammonia Decomposition
Likang Lv1,2, Peiqi Chu1,2, Tong Han1,2
1State Key Laboratory of Materials Low-Carbon Recycling, College of Materials Science and Engineering, Beijing University of Technology, Beijing, China.
Angewandte Chemie (International Ed. in English)
|March 27, 2025
Summary
This study introduces novel Ru/CeO2-CNTs catalysts with double defect sites for efficient ammonia decomposition, achieving high hydrogen production rates and enhanced catalyst stability for energy applications.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Ammonia is a promising hydrogen carrier, but its decomposition faces challenges in catalytic mechanisms and catalyst stability.
- Understanding catalytic pathways and improving catalyst durability are crucial for efficient hydrogen production from ammonia.
Purpose of the Study:
- To synthesize and characterize novel Ru/CeO2-CNTs catalysts with engineered double defect sites.
- To investigate the catalytic mechanisms and enhance the stability of catalysts for ammonia decomposition.
- To achieve high hydrogen production rates from ammonia.
Main Methods:
- Synthesis of Ru/CeO2-CNTs catalysts using a straightforward method.
- Experimental characterization (e.g., TEM, XPS) and theoretical calculations (e.g., DFT).
- Evaluation of catalytic performance for ammonia decomposition at 500 °C.
Main Results:
- Achieved an outstanding hydrogen production rate of 2230 mmol gRu-1 min-1.
- Identified double defect sites (oxygen vacancies and carbon defects) at the CeO2-CNTs interface.
- Demonstrated enhanced electron transfer, modulated NH3 adsorption/activation, and improved N species desorption.
- Observed significantly improved catalyst stability due to CeO2 coating.
Conclusions:
- The engineered double defect sites effectively enhance multiple elementary stages of ammonia decomposition.
- The CeO2 coating improves catalyst durability under harsh conditions.
- This rational design strategy offers insights for developing efficient and stable catalysts for ammonia decomposition.
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