The role of destabilization of palladium hydride in the hydrogen uptake of Pd-containingactivated carbons
Identifieur interne : 000093 ( Main/Exploration ); précédent : 000092; suivant : 000094The role of destabilization of palladium hydride in the hydrogen uptake of Pd-containingactivated carbons
Auteurs : V V Bhat [États-Unis] ; C I Contescu [États-Unis] ; N C Gallego [États-Unis]Source :
- Nanotechnology [ 0957-4484 ] ; 2009.
Abstract
This paper reports on differences in stability of Pd hydride phases in palladium particleswith various degrees of contact with microporous carbon supports. A sample containing Pdembedded in activated carbon fibre (2wt Pd) was compared with commercial Pdnanoparticles deposited on microporous activated carbon (3wt Pd) and with support-freenanocrystalline palladium. The morphology of the materials was characterized by electronmicroscopy, and the phase transformations were analysed over a large range of hydrogenpartial pressures (0.00310 bar) and at several temperatures using in situ x-ray diffraction.The results were verified with volumetric hydrogen uptake measurements. Resultsindicate that higher degrees of Pdcarbon contacts for Pd particles embeddedin a microporous carbon matrix induce efficient pumping of hydrogen out of-PdHx. It was also found that thermal cleaning of carbon surface groups prior toexposure to hydrogen further enhances the hydrogen pumping power of themicroporous carbon support. In brief, this study highlights that the stability of-PdHx phase supported on carbon depends on the degree of contact between Pd and carbon andon the nature of the carbon surface.
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DOI: 10.1088/0957-4484/20/20/204011
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A sample containing Pdembedded in activated carbon fibre (2wt Pd) was compared with commercial Pdnanoparticles deposited on microporous activated carbon (3wt Pd) and with support-freenanocrystalline palladium. The morphology of the materials was characterized by electronmicroscopy, and the phase transformations were analysed over a large range of hydrogenpartial pressures (0.00310 bar) and at several temperatures using in situ x-ray diffraction.The results were verified with volumetric hydrogen uptake measurements. Resultsindicate that higher degrees of Pdcarbon contacts for Pd particles embeddedin a microporous carbon matrix induce efficient pumping of hydrogen out of-PdHx. It was also found that thermal cleaning of carbon surface groups prior toexposure to hydrogen further enhances the hydrogen pumping power of themicroporous carbon support. In brief, this study highlights that the stability of-PdHx phase supported on carbon depends on the degree of contact between Pd and carbon andon the nature of the carbon surface.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Tennessee</li></region></list><tree><country name="États-Unis"><region name="Tennessee"><name sortKey="Bhat, V V" sort="Bhat, V V" uniqKey="Bhat V" first="V V" last="Bhat">V V Bhat</name></region><name sortKey="Contescu, C I" sort="Contescu, C I" uniqKey="Contescu C" first="C I" last="Contescu">C I Contescu</name><name sortKey="Gallego, N C" sort="Gallego, N C" uniqKey="Gallego N" first="N C" last="Gallego">N C Gallego</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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