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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.

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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.

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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.