1980 Volume 53 Issue 8 Pages 2123-2127
The thermal desorption of hydrogen adsorbed on a clean surface of polycrystalline copper foil was studied under ultra high vacuum conditions. The presence of chemisorbed hydrogen in a dissociated state was verified in a temperature range between 193 and 573 K. During the desorption process, the adsorbed hydrogen atoms recombined into molecules; this follows second order kinetics. The activation energy for desorption was 68.6±8.0 kJ mol−1 and remained nearly constant in the range of surface coverage up to 1.6×1014 atom cm−2. The isotope effect on the desorption of deuterium was found to be straightforward. These findings showed a good agreement with the results obtained from the analysis of H2–D2 equilibration on copper powder catalyst. In addition, the necessary conditions to obtain the exact desorption spectra were inspected with the aid of computer simulation.
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