The detailed kinetics of the desorption of hydrogen from polycrystalline copper catalysts

Authors
Tabatabaei, J Sakakini, BH Watson, MJ Waugh, KC
Citation
J. Tabatabaei et al., The detailed kinetics of the desorption of hydrogen from polycrystalline copper catalysts, CATAL LETT, 59(2-4), 1999, pp. 143-149
Citations number
32
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CATALYSIS LETTERS
ISSN journal
1011372X → ACNP
Volume
59
Issue
2-4
Year of publication
1999
Pages
143 - 149
Database
ISI
SICI code
1011-372X(1999)59:2-4<143:TDKOTD>2.0.ZU;2-3
Abstract
The kinetics of desorption of hydrogen from the copper component of an alum ina-supported polycrystalline copper catalyst has been studied in detail by temperature-programmed desorption (TPD). Line-shape analysis of the hydrog en TPD spectra shows: (i) that the desorption is second order, (ii) that th e desorption activation energy is in the range 64-68 kJ mol(-1) in the cove rage range 7-44% of a monolayer, and (iii) that the desorption pre-exponent ial term has a value similar to 10(-5) cm(2) s(-1) atom(-1) consistent with the desorption being second order, involving mobile adsorbates and a mobil e desorption transition state.