Browsing by Author "Lynch, J. F."

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    Calorimetric Determination of Differential Heats of Absorption of Hydrogen by Palladium
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Lynch, J. F.; Flanagan, Ted B.
    Differential heats of absorption of hydrogen by palladium have been measured with an adiabatic calorimeter. For the first time calorimetric heats have been determined for bulk palladium in the single phase, α and β, regions. The heat of absorption in the α-phase (25°C) was found to be 23.32 ± 4.45 kJ (mol H2)–1 and in the β-phase the isosteric heats decrease with hydrogen content from 46.5 (H-to-Pd = 0.61) to 27.3(H-to-Pd = 0.69). (The measured differential (adiabatic) heats have been corrected for compression work to give isosteric heats.) Heats of sorption determined in the α-phase of palladium black reflect contributions due to both absorption and chemisorption of hydrogen. Some preliminary heats of sorption are also reported at – 78°C and at –195°C with palladium black.
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    Thermodynamics of hydrogen dissolved in palladium/rhodium and palladium/platinum alloys
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (03), 1977) Clewley, J. D.; Lynch, J. F.; Flanagan, T. B.
    Partial thermodynamic parameters have been determined for the solution of hydrogen in Pd/Pt and Pd/Rh alloys. The partial excess entropies of absorption of hydrogen at infinite dilution decrease regularly with atom fraction platinum but not with atom fraction rhodium. This suggests that interstices are not excluded for hydrogen occupation by rhodium atoms neighbouring the interstices but are excluded by the platinum nearest neighbours. Other thermodynamic parameters for hydrogen absorption have been determined and are compared for these alloys. These results are discussed in terms of the observation that rhodium will absorb hydrogen at high pressures of hydrogen when situated within the palladium lattice whereas platinum will not.