Sorption and microcalorimetric investigations of palladium/hydrogen interactions on palladium-graphimet intercalation catalyst

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Abstract

Sorption and microcalorimetric investigations of Pd/hydrogen interactions on a 1% Pd-graphimet catalyst at 298.15 K indicated that medium-temperature reduction (MTR; 573 K, H2) caused variations in both the surface and bulk properties of the metal particles. The enthalpy of chemisorption increased from -77 to -102 kJ·mol-1 as a consequence of MTR. The enhanced Pd/hydrogen binding energy contributes to the diminishing catalytic performance of the MTR sample in hydrogenation reactions, as reported previously (refs 1-3). The adsorption of hydrogen was followed by stepwise absorption to produce the α and β interstitial solid solutions. Although a pronounced hysteresis was found in the two-phase region for each sample, significant differences in the location and shape of the hysteresis loops were observed. The changes in the shape and location of the loop upon MTR were explained in terms of an increase in the compressive strain, rather than in the size of the metal crystallites. The enthalpy of β-hydride formation was found to be -36.5 kJ·mol-1, irrespective of the compactness of the metal.

Original languageEnglish
Pages (from-to)465-468
Number of pages4
JournalLangmuir
Volume13
Issue number3
Publication statusPublished - Feb 5 1997

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Palladium
Intercalation
intercalation
sorption
Sorption
palladium
Hydrogen
Metals
catalysts
Catalysts
Enthalpy
hydrogen
enthalpy
hysteresis
metal particles
interactions
void ratio
Chemisorption
Hysteresis loops
Binding energy

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

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title = "Sorption and microcalorimetric investigations of palladium/hydrogen interactions on palladium-graphimet intercalation catalyst",
abstract = "Sorption and microcalorimetric investigations of Pd/hydrogen interactions on a 1{\%} Pd-graphimet catalyst at 298.15 K indicated that medium-temperature reduction (MTR; 573 K, H2) caused variations in both the surface and bulk properties of the metal particles. The enthalpy of chemisorption increased from -77 to -102 kJ·mol-1 as a consequence of MTR. The enhanced Pd/hydrogen binding energy contributes to the diminishing catalytic performance of the MTR sample in hydrogenation reactions, as reported previously (refs 1-3). The adsorption of hydrogen was followed by stepwise absorption to produce the α and β interstitial solid solutions. Although a pronounced hysteresis was found in the two-phase region for each sample, significant differences in the location and shape of the hysteresis loops were observed. The changes in the shape and location of the loop upon MTR were explained in terms of an increase in the compressive strain, rather than in the size of the metal crystallites. The enthalpy of β-hydride formation was found to be -36.5 kJ·mol-1, irrespective of the compactness of the metal.",
author = "Z. Kir{\'a}ly and A. Mastalir and F. Berger and I. D{\'e}k{\'a}ny",
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T1 - Sorption and microcalorimetric investigations of palladium/hydrogen interactions on palladium-graphimet intercalation catalyst

AU - Király, Z.

AU - Mastalir, A.

AU - Berger, F.

AU - Dékány, I.

PY - 1997/2/5

Y1 - 1997/2/5

N2 - Sorption and microcalorimetric investigations of Pd/hydrogen interactions on a 1% Pd-graphimet catalyst at 298.15 K indicated that medium-temperature reduction (MTR; 573 K, H2) caused variations in both the surface and bulk properties of the metal particles. The enthalpy of chemisorption increased from -77 to -102 kJ·mol-1 as a consequence of MTR. The enhanced Pd/hydrogen binding energy contributes to the diminishing catalytic performance of the MTR sample in hydrogenation reactions, as reported previously (refs 1-3). The adsorption of hydrogen was followed by stepwise absorption to produce the α and β interstitial solid solutions. Although a pronounced hysteresis was found in the two-phase region for each sample, significant differences in the location and shape of the hysteresis loops were observed. The changes in the shape and location of the loop upon MTR were explained in terms of an increase in the compressive strain, rather than in the size of the metal crystallites. The enthalpy of β-hydride formation was found to be -36.5 kJ·mol-1, irrespective of the compactness of the metal.

AB - Sorption and microcalorimetric investigations of Pd/hydrogen interactions on a 1% Pd-graphimet catalyst at 298.15 K indicated that medium-temperature reduction (MTR; 573 K, H2) caused variations in both the surface and bulk properties of the metal particles. The enthalpy of chemisorption increased from -77 to -102 kJ·mol-1 as a consequence of MTR. The enhanced Pd/hydrogen binding energy contributes to the diminishing catalytic performance of the MTR sample in hydrogenation reactions, as reported previously (refs 1-3). The adsorption of hydrogen was followed by stepwise absorption to produce the α and β interstitial solid solutions. Although a pronounced hysteresis was found in the two-phase region for each sample, significant differences in the location and shape of the hysteresis loops were observed. The changes in the shape and location of the loop upon MTR were explained in terms of an increase in the compressive strain, rather than in the size of the metal crystallites. The enthalpy of β-hydride formation was found to be -36.5 kJ·mol-1, irrespective of the compactness of the metal.

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