INVESTIGADORES
ROMA Federico Jose
artículos
Título:
Multilayer Adsorption with Multisite-Occupancy: An Improved Isotherm for Surface Characterization
Autor/es:
J. L. RICCARDO; A. J. RAMIREZ-PASTOR; F. ROMÁ
Revista:
LANGMUIR
Editorial:
American Chemical Society
Referencias:
Lugar: USA; Año: 2002 vol. 18 p. 2130 - 2134
ISSN:
0743-7463
Resumen:
In this work, an improved solution for multilayer adsorption of linear species is presented. The particular case of multilayer dimer adsorption is dealt with in detail, and a new adsorption isotherm is obtained for determination of surface area and adsorption energy from experiments. From the comparison between the new isotherm and the standard Brunauer-Emmett-Teller (BET) formalism, it arises that the monolayer volume, vm (or the surface area, A), can be up to 1.5 times larger than the one from the BET model. The proposed model is simple and easy to apply in practice and leads to new values of surface area and adsorption heat. Physically, these advantages are a consequence of properly considering the configurational entropy of the adsorbate.