Surface characteristics, hydrogen sorption, and catalytic properties of PD-ZR alloys

F. Berger, M. Varga, Gabriele Mulas, Árpád Molnár, I. Dékány

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Significant differences are observed in the hydrogen sorption behavior of as-received, HF-treated, and oxidized PdZr alloys. Removal by HF treatment of the surface ZrO2 layer, which blocks sorption of hydrogen, and a part of the bulk Zr generates a porous surface layer of increased surface area. The resulting specimen sorbs hydrogen even at low H2 partial pressure. A thick oxide layer composed of a mixture of PdO and ZrO2 is formed by aerobic oxidation (553 K, 3 h). A diffusion controlled slow H2 sorption by Pd in the surface layer followed by a rapid and large H2 sorption by the bulk alloy is observed. This results in the fracturing of the surface oxide layer and the formation of the hydrides of the constituent elements. The pretreated alloy samples studied exhibit high catalytic activities and selectivities in the hydrogenation of compounds with multiple unsaturation (cycloocta-1,3-diene, phenylacetylene, 1-pentyne).

Original languageEnglish
Pages (from-to)3692-3697
Number of pages6
JournalLangmuir
Volume19
Issue number9
DOIs
Publication statusPublished - Apr 29 2003

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sorption
Sorption
Hydrogen
surface layers
hydrogen
Oxides
oxides
fracturing
dienes
Catalyst selectivity
hydrogenation
hydrides
partial pressure
catalytic activity
low pressure
Hydrides
selectivity
Partial pressure
Hydrogenation
Catalyst activity

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Surface characteristics, hydrogen sorption, and catalytic properties of PD-ZR alloys. / Berger, F.; Varga, M.; Mulas, Gabriele; Molnár, Árpád; Dékány, I.

In: Langmuir, Vol. 19, No. 9, 29.04.2003, p. 3692-3697.

Research output: Contribution to journalArticle

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