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Updated: Aug 16, 2025
Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Fabricating Robust Pt Clusters on Sn-Doped CeO2 for CO Oxidation: A Deep Insight into Support Engineering and Surface
Qinglong Liu1, Peng Yang1, Wei Tan1
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment; Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
Tuning oxygen vacancies in cerium tin oxide (CSO) supports significantly enhances platinum (Pt) nanoparticle catalysis. This method creates smaller Pt clusters, improving CO oxidation performance for vehicle emission control.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Nanoparticle size critically impacts catalytic performance.
- Oxygen vacancies in metal-oxide supports can tune nanoparticle size and enhance catalysis.
- Platinum (Pt) catalysts are vital for applications like vehicle emission control.
Purpose of the Study:
- To synthesize cerium-tin solid solutions (CSO) with abundant oxygen vacancies.
- To investigate the effect of these CSO supports on Pt nanoparticle size and CO oxidation catalysis.
- To elucidate the mechanism behind the enhanced catalytic activity.
Main Methods:
- Synthesis of Ce-Sn solid solutions (CSO).
- Loading of Pt species onto CSO and CeO2 supports.
- Activation via CO reduction.
- Characterization of Pt cluster sizes and catalytic performance for CO oxidation.
Main Results:
- Pt/CSO catalysts exhibited significantly improved CO oxidation performance compared to Pt/CeO2.
- CO reduction transformed ionic Pt sites into active Pt clusters.
- Smaller Pt clusters (approx. 1.2 nm) were formed on CSO due to more exposed oxygen vacancies, versus approx. 1.8 nm on CeO2.
- Enhanced Pt cluster dispersion and oxygen activation contributed to higher catalytic activity.
Conclusions:
- CSO supports with abundant oxygen vacancies effectively reduce Pt cluster size.
- The enhanced catalytic activity of Pt/CSO is attributed to smaller, more dispersed Pt clusters with improved oxygen activation capabilities.
- These findings offer a promising strategy for developing advanced catalysts for vehicle emission control.
