An attempt to bridge the pressure and material gap with a disperse model catalyst for low-temperature alkane reforming

J. Find, Z. Paál, R. Schlögl, U. Wild

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Pt black was exposed to n-hexane/H2 mixtures between 483 and 663 K followed by O2 and H2 treatments at 603 K. XP and UP spectra were measured without exposing the samples to air. 20-30% carbon accumulated after hydrocarbon exposures. O2 removed most carbon. The surface C content increased after a subsequent contact with H2, C 1s showing more "atomic carbon" as opposed to graphite after n-hexane exposure. Anisotropic recrystallization of Pt black favoring (220) and (311) lattice planes occurred under hydrogen-rich conditions. Both findings were attributed to a H2-induced solid-state rearrangement; H atoms penetrating into the crystal lattice, force subsurface carbon and oxygen atoms to the surface and a concomitant restructuring would occur. Thus another "hydrogen effect" has been recognized, leading to structures favorable for skeletal reactions of alkanes.

Original languageEnglish
Pages (from-to)19-23
Number of pages5
JournalCatalysis Letters
Volume65
Issue number1-3
Publication statusPublished - Mar 2000

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Alkanes
Reforming reactions
Paraffins
alkanes
Carbon
catalysts
Catalysts
carbon
Hexane
Hydrogen
Atoms
Temperature
Graphite
hydrogen
Hydrocarbons
crystal lattices
Crystal lattices
atoms
oxygen atoms
graphite

Keywords

  • Catalyst restructuring
  • Crystal anisotropy
  • N-hexane
  • Pt black
  • Surface carbon
  • Surface oxygen
  • UPS
  • XPS
  • XRD

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

An attempt to bridge the pressure and material gap with a disperse model catalyst for low-temperature alkane reforming. / Find, J.; Paál, Z.; Schlögl, R.; Wild, U.

In: Catalysis Letters, Vol. 65, No. 1-3, 03.2000, p. 19-23.

Research output: Contribution to journalArticle

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