Abstract
The solubility of hydrogen in palladium, m, defined as the number of dissolved hydrogen atoms divided by the total number of metal atoms has been measured between 273 and 343 K from 13.3 to 53.3 kPa. At a given temperature and pressure, m was found to decrease linearly as the percentage dispersion D of the metal increased, m being zero at D = 100%. Measurements of m were carried out under conditions such that the surface of the metal particles was covered with almost a monolayer of hydrogen. This chemisorbed hydrogen seems to affect solubility of hydrogen in bulk palladium in a way similar to that of silver in palladium-silver alloys. Values of m are potentially helpful in the characterization of used palladium catalysts.
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