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Related Concept Videos

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Hydrogen storage mediated by Pd and Pt nanoparticles.

Miho Yamauchi1, Hirokazu Kobayashi, Hiroshi Kitagawa

  • 1Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan. yamauchi@cat.hokudai.ac.jp

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 14, 2009
PubMed
Summary

Metal nanoparticles offer new hydrogen storage possibilities. Novel interfaces in palladium/platinum nanoparticles stabilize hydrogen, suggesting potential for advanced hydrogen storage materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Hydrogen storage properties of metal nanoparticles are size-dependent.
  • Palladium (Pd) and Platinum (Pt) nanoparticles exhibit distinct hydrogen absorption behaviors.
  • Nanosize effects significantly alter hydrogen solubility and equilibrium pressures.

Purpose of the Study:

  • To investigate the origins of nanosize effects in hydrogen storage within Pd and Pt nanoparticles.
  • To identify novel hydrogen absorption sites in bimetallic core/shell nanoparticles.
  • To explore the potential of metal nanoparticles as hydrogen storage media.

Main Methods:

  • Systematic studies of hydrogen storage in palladium and platinum nanoparticles.
  • Characterization of Pd/Pt core/shell bimetallic nanoparticles.
  • Analysis of hydrogen absorption at hetero-interfaces.

Main Results:

  • Hydrogen solubility and hydride formation pressure decrease with decreasing particle size in Pd nanoparticles.
  • Hydrogen solubility increases in Pt nanoparticles, where bulk storage is not possible.
  • A novel hydrogen absorption site was identified at the hetero-interface of Pd/Pt core/shell nanoparticles.
  • The electric potential at the hetero-interface stabilizes hydrogen atoms.

Conclusions:

  • Metal nanoparticles, particularly bimetallic ones, can serve as effective hydrogen storage materials.
  • Understanding nanosize effects is crucial for designing improved hydrogen storage media.
  • The hetero-interface in core/shell nanoparticles presents a promising site for hydrogen stabilization.