Abstract
The para-ortho hydrogen conversion has been studied on a series of evaporated silver-palladium alloy films, of composition 50% Ag-50% Pd, 70% Ag-30% Pd, 80% Ag-20% Pd, and 100% Ag, in the temperature range 273 ° to 413 °K. Details are given for the preparation and characterization of homogeneous palladium-silver alloy films (~2000-Å thickness), which were formed by controlled evaporation from palladium-silver alloy wires. X-Ray diffraction and X-ray fluorescence techniques were used to analyze the films throughout the reaction vessel. The compositions were constant to within 3% over geometric film areas of 120 cm 2. The activation energy for the conversion increased with silver content of the alloy, with a sharp rise between the 50% Ag and 70% Ag alloy. A linear compensation effect between the activation energy and frequency factor for the conversion on the alloy series was observed. Heats of adsorption of hydrogen on the alloy films were calculated from the pressure dependency of the reaction at constant temperature. By comparing the experimentally determined entropy changes upon adsorption with calculated values it is concluded that the adsorbed hydrogen film, on the silver-rich alloys, is mobile.
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