Infra-red determination of the isotherm of hydrogen adsorption on a Pt/Al2O3 catalyst
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 70, 293-298
- https://doi.org/10.1039/f19747000293
Abstract
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/Al2O3 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.Keywords
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