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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
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Structure-reactivity correlations in Pd-Au bimetallic nanoclusters.

Elad Gross1, Micha Asscher

  • 1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 3, 2010
PubMed
Summary

The structure of palladium-gold (Pd-Au) nanoclusters impacts their reactivity. Buffer layer assisted growth (BLAG) Pd-Au clusters show higher activity for acetylene conversion than direct deposition (DD) clusters.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Bimetallic nanoclusters are crucial catalysts.
  • Understanding composition and morphology effects on reactivity is vital.
  • Acetylene conversion is a key chemical probe reaction.

Purpose of the Study:

  • To investigate how Pd-Au nanocluster composition and morphology influence chemical reactivity.
  • To compare the reactivity of different nanocluster structures using acetylene decomposition.
  • To correlate nanocluster properties with catalytic performance.

Main Methods:

  • High-resolution transmission electron microscopy (HR-TEM) for structural analysis.
  • CO-Temperature Programmed Desorption (TPD) for chemical composition determination.
  • Direct deposition (DD) and buffer layer assisted growth (BLAG) methods for nanocluster preparation.

Main Results:

  • BLAG Pd-Au nanoclusters exhibited higher reactivity than DD particles.
  • Different morphologies (tilted vs. flat-laying benzene adsorption) were observed based on preparation method.
  • A strong preference for ethylene formation over benzene was noted, linked to the absence of extended Pd(111) facets.

Conclusions:

  • Nanocluster morphology significantly affects catalytic activity and product selectivity.
  • The BLAG method yields more reactive bimetallic nanoclusters.
  • Suppression of benzene formation is attributed to specific nanostructure features, favoring ethylene production.