CeO2-Supported TiO2-Pt Nanorod Composites as Efficient Catalysts for CO Oxidation
Haiyang Wang1, Ruijuan Yao1, Ruiyin Zhang1
1Xi'an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi'an 710123, China.
Molecules (Basel, Switzerland)
|February 25, 2023
Summary
New nanorod catalysts combining platinum (Pt), titanium dioxide (TiO2), and cerium dioxide (CeO2) offer enhanced CO oxidation activity. This stable structure overcomes Pt cost and aggregation issues for advanced catalytic applications.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Supported platinum (Pt)-based catalysts are highly selective for CO oxidation.
- High cost, scarcity of Pt, and aggregation at high temperatures limit their application.
- Developing stable, cost-effective alternatives with high catalytic activity is crucial.
Purpose of the Study:
- To synthesize and characterize nanorod structured (TiO2-Pt)/CeO2 catalysts.
- To investigate the effect of TiO2 doping on Pt/CeO2 catalyst performance for CO oxidation.
- To explore the structure-activity relationship for enhanced catalytic applications.
Main Methods:
- Combined dealloying and calcination method for catalyst synthesis.
- X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Scanning Transmission Electron Microscopy (STEM) for characterization.
- Evaluation of catalytic activity for CO oxidation.
Main Results:
- Successfully synthesized nanorod structured (TiO2-Pt)/CeO2 catalysts with 0.3 at% Pt and varying Ti ratios.
- Characterization confirmed semi-inlayed Pt nanoparticles on CeO2 nanorods and highly dispersed TiO2.
- The resulting catalysts exhibited high specific surface area, large pore volume, and enhanced catalytic activity for CO oxidation.
- The unique nanostructure provides abundant reaction pathways and active sites.
Conclusions:
- The developed (TiO2-Pt)/CeO2 catalysts demonstrate outstanding catalytic performance for CO oxidation.
- The enhanced activity is attributed to the stable nanorod structure, proper TiO2 doping, and synergistic effects between Pt, TiO2, and CeO2.
- This research is significant for advancing high-performance nanoporous catalytic materials.
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