par Crucq, A.;Liénard, Georges 
;Degols, L.;Frennet, Alfred
Référence Applications of Surface Science, 17, 1, page (79-96)
Publication Publié, 1983-09
;Degols, L.;Frennet, Alfred Référence Applications of Surface Science, 17, 1, page (79-96)
Publication Publié, 1983-09
Article révisé par les pairs
| Résumé : | H2 adsorption isotherms are measured on Rh films, unsupported Rh powder and Al2O3 supported Rh catalyst in extended ranges of temperature (193-500 K) and pressure (10-7-10-2 Torr for films, 10-3-10 Torr for Rh powders). Isosteric heat and entropy of adsorption over a large range of coverage are calculated and compared with literature date. It is shown that the adsorption heat at zero coverage does not depend on the Rh form (single crystal, tip, sintered films, powders). On the basis of our results, the usual procedure concerning the use of hydrogen coverage in kinetic equations and related calculations of the dependence viz, hydrogen of catalytic reactions, viz. hydrogen pressure, are questioned. © 1983. |
