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/Al 2O3 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 × 104 J mol-1) and the isosteric heat of adsorption are in good agreement with previous calorimetric data.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases|
|State||Published - Dec 1 1974|
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