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Formation of a Pt-MgO Solid Solution: Analysis by X-ray Absorption Fine Structure Spectroscopy
Kazu Okumura1, Hitomi Hoshi1, Hikaru Iiyoshi1
1Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano-machi, Hachioji 192-0015, Tokyo, Japan.
ACS Omega
|August 15, 2022
Summary
Thermal treatment of platinum (Pt) nanoparticles on MgO forms a Pt-MgO solid solution, enhancing Pt dispersion. This Pt-MgO solid solution exhibits a Pt valence of 4+ and improved catalytic properties compared to other supports.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Platinum nanoparticles are crucial catalysts.
- Understanding metal-support interactions is key for catalyst design.
- Magnesium oxide (MgO) is a potential catalyst support material.
Purpose of the Study:
- To investigate the formation and properties of platinum-magnesium oxide (Pt-MgO) solid solutions.
- To determine the effect of thermal treatment on Pt nanoparticles supported on MgO.
- To compare the dispersion of Pt on MgO with other supports like Al2O3 and SiO2.
Main Methods:
- Thermal treatment of Pt nanoparticles and Pt(acac)2 on MgO.
- Pt L3-edge X-ray absorption fine structure (XAFS) spectroscopy.
- Density Functional Theory (DFT) calculations.
- CO adsorption for dispersion measurements.
Main Results:
- Formation of a Pt-MgO solid solution evidenced by XAFS.
- Pt in the solid solution has a valence of 4+.
- Observed shrinkage in Pt-O bond distance, consistent with DFT.
- Pt and MgO segregation occurred at 1273 K.
- Significantly higher Pt dispersion on MgO compared to Al2O3 or SiO2.
Conclusions:
- Thermal treatment leads to the formation of a Pt-MgO solid solution.
- The Pt-MgO solid solution enhances Pt dispersion, suggesting improved catalytic performance.
- The findings provide insights into metal-support interactions for advanced catalyst development.
