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Optimizing the Microstructure of SnO2-CeO2 Binary Oxide Supported Palladium Catalysts for Efficient and Stable
Jiangli Huang1, Jia Lin1, Xiaohua Chen1
1College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou 350007, Fujian, P. R. China.
ACS Applied Materials & Interfaces
|April 4, 2022
Summary
Tuning tin dioxide-cerium dioxide supports enhances palladium catalysts for methane combustion. This novel approach improves catalytic activity and stability, crucial for efficient and durable methane conversion.
Area of Science:
- Materials Science
- Catalysis
- Environmental Chemistry
Background:
- Developing highly active and stable palladium catalysts for methane combustion is critical.
- Hydrothermal stability remains a significant challenge for existing catalysts.
Purpose of the Study:
- To enhance the performance of palladium catalysts supported on tin dioxide-cerium dioxide binary oxides.
- To investigate the effect of support composition on catalyst activity and stability.
Main Methods:
- Facile synthesis strategy for palladium catalysts on tunable SnO2-CeO2 supports.
- Characterization of catalyst microstructure, including crystallite size and solid solution formation.
- Evaluation of catalytic activity and stability under various conditions (dry, wet, thermal cycling).
Main Results:
- Optimized SnO2-CeO2 ratio (5Sn5Ce) facilitated Pd-Ce-O and Pd-Sn-O solid solutions with reduced crystallite size.
- Enhanced metal-support interaction stabilized active PdO and promoted reoxidation.
- Increased oxygen vacancies improved PdO reducibility and methane dissociation.
- Pd/5Sn5Ce catalyst achieved T99 of ~360 °C with excellent dry/wet and thermal stability.
Conclusions:
- Tuning the SnO2-CeO2 support composition is an effective strategy to boost palladium catalyst performance for methane combustion.
- The synergistic effects between the support and palladium are key to achieving high activity and stability.
- The developed Pd/5Sn5Ce catalyst shows great promise for practical applications in methane oxidation.
