(49f) Isosteric Heats of Adsorption in the Henry's Law Region for Carbon Cylindrical Nanopores and Spherical Nanocavities
AIChE Annual Meeting
2009 Annual Meeting
Plenary On Fundamentals and Applications of Adsorption and Ion Exchange I
Monday, November 9, 2009 - 10:15am to 10:36am
The isosteric heat of adsorption in the Henry's law region is calculated as a function of pore width for a molecule adsorbed in a carbon cylindrical nanopore and in a carbon spherical nanocavity. These geometries are models for a single-wall carbon nanotube (SWNT) and fullerene (C60). The maximum isosteric heat of adsorption is obtained for six gas molecules: argon, methane, carbon dioxide, hydrogen, helium, and nitrogen. In addition, the results for the cylindrical nanopore are compared with adsorption data from the literature for a SWNT. We determine the pore width where the isosteric heat of adsorption is a maximum for each of the geometries. Constant relationships between the pore diameters for the maximum isosteric heat of adsorption and the specific solid-fluid Lennard-Jones (LJ) parameters are found for cylindrical nanopores, spherical nanocavities, and parallel-wall slit-shaped pores. Surface mean curvature has a significant influence on the isosteric heat of adsorption.