Abstract
IN order to measure the adsorption of hydrogen by pure nickel, free from oxygen, I used a silica tube, containing 12 kilometres of a very thin nickel wire (total weight of the wire 42 grams, mean diameter 0.022 mm.), giving an available surface of at least 8,400 cm.2. The preliminary results indicate that between 200° and 650° C., and pressures up to 0.2 mm. Hg, there is no measurable adsorption of hydrogen, but an appreciable absorption (homogeneous solution). The results are in good agreement with Sieverts' measurements with much thicker nickel wire at higher pressures and temperatures1. The amount of absorbed hydrogen at a constant temperature is, within the experimental error, proportional to the square root of the pressure, and increases at constant pressure with increasing temperature, obeying the simple equation: log a = A B/T. The heat of absorption, calculated from this isobare, is a little less than 3 k.cal. per gram mol hydrogen.
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References
A. Sieverts, Z. physik. Chem., 60, 129; 1907. A. Sieverts, and J. Hagenacker, Ber., 42, 338; 1909. A. Sieverts, Z. physik. Chem., 77, 591; 1911.
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SMITTENBERG, J. Absorption of Hydrogen by Nickel. Nature 133, 872 (1934). https://doi.org/10.1038/133872a0
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DOI: https://doi.org/10.1038/133872a0
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