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Preformed Pt Nanoparticles Supported on Nanoshaped CeO2 for Total Propane Oxidation
Shasha Ge1,2, Yufen Chen2, Xuan Tang1
1Key Laboratory for Advanced and Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.
ACS Applied Nano Materials
|August 31, 2023
Summary
Platinum catalysts on cerium oxide ({CeO2}) with {111} facets efficiently oxidize propane. This morphology enhances catalytic activity and stability, offering a promising solution for volatile organic compound (VOC) removal.
Area of Science:
- Materials Science
- Catalysis
- Environmental Chemistry
Background:
- Platinum (Pt)-based catalysts are crucial for removing short-chain volatile organic compounds (VOCs) like propane.
- Understanding the influence of catalyst support morphology is key to optimizing catalytic performance.
Purpose of the Study:
- To investigate the impact of cerium oxide (CeO2) support morphology on the complete oxidation of propane using Pt nanoparticles.
- To compare the catalytic activity and stability of Pt/CeO2 catalysts with different exposed facets.
Main Methods:
- Synthesis of Pt nanoparticles (approx. 2.4 nm) supported on various fine-shaped CeO2 materials with distinct facets ({111}, {110}, {100}).
- Evaluation of catalytic activity for propane oxidation.
- Characterization using X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS).
Main Results:
- The Pt/CeO2 catalyst with {111} facets (Pt/CeO2-o) demonstrated significantly higher catalytic activity than those with {110} and {100} facets (Pt/CeO2-r).
- Pt/CeO2-o exhibited a 1.8-fold higher turnover frequency (TOF) and superior long-term stability over 50 hours.
- Surface analysis indicated that Pt/CeO2-o benefits from abundant metallic Pt species, facilitating C-C bond cleavage and formate species removal.
Conclusions:
- CeO2 morphology, specifically the prevalence of {111} facets, plays a critical role in enhancing the catalytic performance of Pt-based catalysts for propane oxidation.
- The {111} facet promotes optimal Pt speciation and surface reaction pathways, leading to improved activity and stability.
- This study provides valuable insights for designing advanced Pt/CeO2 catalysts for efficient VOC abatement.
