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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Bimetallic Pt-Pd nano-catalyst: size, shape and composition matter.

Rafael Mendoza-Pérez1, Grégory Guisbiers2

  • 1Instituto de Investigaciones en Materiales, UNAM, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, 04510 CDMX, México.

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|April 10, 2019
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This study reveals how platinum-palladium (Pt-Pd) nanoparticle size and shape influence their phase diagram and catalytic activity. Smaller sizes and specific shapes like tetrahedrons and cubes show enhanced catalytic properties, with reversed surface segregation below a critical size.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Understanding the phase diagram (PHAD) of platinum-palladium (Pt-Pd) alloys is crucial for designing effective catalysts.
  • Size and shape significantly influence the thermodynamic and catalytic properties of nanoparticles.

Purpose of the Study:

  • To investigate the impact of size and shape on the PHAD of Pt-Pd nanoparticles.
  • To correlate these nanoscale phase behaviors with catalytic activity.
  • To determine the critical size for reversed surface segregation in Pt-Pd nanoparticles.

Main Methods:

  • Utilized nano-thermodynamics to theoretically determine size and shape effects on Pt-Pd nanoparticle PHAD.
  • Analyzed Gibbs free energy to assess the stability of various nanoparticle shapes across different temperatures and compositions.
  • Calculated surface segregation to understand elemental distribution at the nanoparticle surface.

Main Results:

  • Pt-Pd nanoparticle PHAD exhibits a congruent melting point that intensifies with decreasing size.
  • The coexistence region of the PHAD contracts on the Pt-rich side and expands at higher Pd concentrations.
  • Surface segregation reverses below a critical size, with Pt segregating to the surface instead of Pd.
  • Tetrahedron and cube shapes are predicted to be the most catalytically active.

Conclusions:

  • Nanoparticle size and shape critically alter Pt-Pd phase behavior and surface properties.
  • Specific shapes, like tetrahedrons and cubes, demonstrate superior catalytic potential.
  • The observed reversal in surface segregation at small sizes has significant implications for catalyst design and performance.