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Mixed aromatic-alkyne system on a Pd surface: a first-principles study.

Amitesh Maiti1, Richard Gee, Robert Maxwell

  • 1Lawrence Livermore National Laboratory, University of California, Livermore, California 94551, USA.

The Journal of Physical Chemistry. B
|February 24, 2006
PubMed
Summary
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Density functional theory reveals how 1,4-diphenyl-butadiyne interacts with palladium surfaces. Hydrogen readily dissociates and bonds with the molecule, while impurities like CO and CO2 show varied reactivity.

Area of Science:

  • Surface Science
  • Computational Chemistry
  • Materials Science

Background:

  • Mixed aromatic-alkyne systems are crucial in industrial chemical processes.
  • Understanding molecule-metal interactions is key for catalyst design.

Purpose of the Study:

  • Investigate the chemistry of 1,4-diphenyl-butadiyne (DPB) on Pd(110) and Pd(111) surfaces using DFT.
  • Explore reaction pathways, energetics, and the influence of impurities (CO, CO2) on hydrogen chemistry.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Analysis of H2 adsorption, dissociation, and migration.
  • Assessment of DPB-metal interactions and H uptake energetics.
  • Evaluation of CO and CO2 effects on hydrogen chemistry.

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Main Results:

  • DPB exhibits strong binding to Pd surfaces, particularly Pd(110), due to aromatic-metal interactions.
  • H2 dissociates on Pd, with hydrogen radicals efficiently incorporated into DPB's alkyne bonds.
  • CO binds strongly to Pd but weakly to H radicals; CO2 binds weakly to Pd but may react with H.

Conclusions:

  • The study elucidates the detailed surface chemistry of DPB on palladium.
  • Findings provide insights into hydrogen uptake mechanisms and the moderating effects of common industrial impurities.
  • Results are valuable for optimizing catalytic processes involving similar systems.