Abstract
Temperature-programmed absorption of hydrogen in palladium powder is used to determine the activation energy of absorption at low hydrogen concentrations. In this technique the amount of hydrogen absorbed by the palladium is measured as a function of temperature which is increased linearly in time. This technique is suitable in a temperature region where the hydrogen absorption rate is very low. We have found that the activation energy is 15.9 ± 1.3 kJ (mol H 2) −1 for absorptions in the temperature region 130–160 K. This value is in agreement with that obtained by calorimetric measurements made by Couper and John for the same temperature region. However, it is lower than the value obtained by measuring the variations in the electrical resistance during the absorption of low amounts of hydrogen into a phase palladium foil at room temperature and above.
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