Pd-4at%Pt合金による水素吸収の動力学的研究

概要

論文の詳細を見る
The kinetics of hydrogen absorption by a Pd-4 at%Pt alloy was studied in the temperature range of 0 to 80 C and pressure from 0.1 to 10 Torr by using a vacuum microbalance. The absorption kinetics extending over the entire absorption curve be analyzed by a diffusion model assuming notable contributions from dissociative adsorption of hydrogen molecules and associative desorption of adsorbed hydrogen atoms on the surface. The activation energies for absorption and desorption were determined to be 4.6 and 9.0 kcal/mol (H2), respectively. Based on these values, the heat of the hydrogen solution was evaluated to be -4.6 kcal/mol (H2), which is in good agreement with the value obtained by thermodynamic study. In addition, the activation energy for diffusion was determined to be 7.1 kcal/mol (H), causing slower hydrogen diffusion in the alloy than Pd.
富山大学の論文