Browsing by Author "Mathieu, Michel-Vital"

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    Infra-red Determination of the Isotherm of Hydrogen Adsorption on a Pt/Al2O3 Catalyst
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Primet, Michel; Basset, Jean-Marie; Mathieu, Michel-Vital
    Of the various forms of hydrogen adsorbed on platinum only hydrogen weakly and reversibly adsorbed is detected by an infra-red band at 2120 cm-1. The preparation of a well dispersed sample of Pt/ALO? catalyst containing 10 % platinum allows us to determine accurately the hydrogen adsorption isotherm of this weakly adsorbed species. Only a dissociative Langmuir model fits the experimental results in the pressure range of 10'1 to 700 Torr and temperature range of 27 to 95°C. The heat of adsorption (—5 x 104 J mol-1) and the isosteric heat of adsorption are in good agree ment with previous calorimetric data.