Strong Metal-Support Interaction between Pt and TiO2 over High-Temperature CO2 Hydrogenation
Xiaochun Hu1, Dan Xu2,3, Jianchun Jiang2,3
1School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, 210042, China.
Oxygen vacancies in rutile-supported platinum nanoparticles enhance catalytic stability for CO2 hydrogenation. This prevents strong metal-support interaction (SMSI), improving performance in the reverse water-gas shift reaction.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Metal-support interactions (MSI) critically influence oxide-supported metal catalyst activity and stability.
- Surface properties like phase and defects of the support are key to MSI, encompassing strong metal-support interaction (SMSI) and electronic metal-support interaction (EMSI).
Purpose of the Study:
- To modulate SMSI on rutile-supported Pt nanoparticles (NP) during high-temperature CO2 hydrogenation.
- To investigate the role of oxygen vacancies in enhancing catalytic stability and preventing SMSI.
Main Methods:
- High-temperature CO2 hydrogenation experiments on rutile-supported Pt NPs.
- Density Functional Theory (DFT) calculations to understand electronic interactions.
- Controlled modulation of TiO2-x overlayers on Pt NP surfaces via defects.
Main Results:
- Oxygen vacancy defects significantly enhance catalytic stability of Pt/rutile in the reverse water-gas shift (RWGS) reaction at 800°C.
- Pt/rutile with oxygen vacancies achieved a space time yield of 301 molCO⋅gM⁻¹⋅h⁻¹ with only an 8% decrease in stability over 100 hours.
- DFT calculations indicated reduced electron transfer from Pt to rutile due to oxygen vacancies, preserving Pt's metallic nature and inhibiting SMSI.
Conclusions:
- Oxygen vacancies on Pt/rutile catalysts effectively inhibit SMSI formation during high-temperature CO2 hydrogenation.
- Defect engineering of oxide supports offers a promising strategy to enhance catalyst stability and performance.
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