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Fast and real-time observation of hydrogen absorption kinetics for palladium nanoparticles

Author:
Matsumura, Daiju  Okajima, Yuka  Nishihata, Yasuo  Mizuki, Jun'ichiro  


Journal:
JOURNAL OF ALLOYS AND COMPOUNDS


Issue Date:
2011


Abstract(summary):

Structural change of Pd nanoparticles on aluminum oxide during hydrogen absorption reaction was directly observed by X-ray absorption fine structure with dispersive optics. Hydrogen pressure dependence of the expansion of the interatomic distance for Pd-Pd bonding in Pd nanoparticles was investigated by real-time-resolved and in situ observation with a rate of 50 Hz at room temperature. It has been revealed that the Pd nanoparticles show strong hydrogen pressure dependence of the reaction rate and the saturated interatomic distance for the hydrogen absorption. Determined reaction order implies that the rate of the hydrogen absorption reaction is limited by the surface dissociative adsorption step. (C) 2010 Elsevier B.V. All rights reserved.


Page:
S849---S852


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