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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 429582.0, Fritz-Haber-Institut / Inorganic Chemistry
Platinum/Graphite Nanofiber Catalysts of Various Structure: Characterization and Catalytic Properties
Authors:Baker, R. Terry K.; Rodriguez, Nelly; Mastalir, Ágnes; Wild, Ute; Schlögl, Robert; Wootsch, Attilla; Paál, Zoltan
Research Context:Platinum in Catalysis
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem.B
Issue / Number:38
Start Page:14348
End Page:14355
Copyright:Copyright © 2004 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Platinum/graphite nanofiber (Pt/GNF) catalysts were prepared by impregnating three types of GNF (herringbone, H; ribbon, R; and platelet, P) with Pt salt dissolved in organic solvents. Electron microscopy showed small Pt particles (1.5−8 nm) in all catalysts. The ethanol−toluene solvent of the Pt salt corrupted the ordered nanofiber structure of Pt/GNF-P. Butanol solvent did not harm the nanofiber. Nevertheless, X-ray photoelectron spectroscopy (XPS) indicated that the structure of all three samples was essentially graphitic. Surface Pt enrichment was observed on Pt/GNF-H and depletion on the (corrupted) Pt/GNF-P. Catalytic properties were checked in the skeletal reactions of hexane in H2 between 543 and 603 K. Both the activity and the formation of isomers were the most marked on Pt/GNF-H, where also the hydrogen migration to storage positions on the support was most pronounced. Repeated regeneration with oxygen did not alter the catalytic propensities. High isomerization selectivity is attributed to creating hydrogen-rich active sites on Pt by the back-migration of hydrogen retained by the nanofiber structure of the support. Product selectivities can be used as an indirect indicator for the hydrogen storage capacity of GNF samples.
Free Keywords:catalyst support; EUROPT-1; graphite nanofiber; hexane transformation; platinum/graphite nanofiber; Pt/GNF catalyst
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Surface Analysis
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720
Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
Identifiers:URL:http://dx.doi.org/10.1021/jp0400519 [only for subscriber]
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