Henry's Law as a Limit for an Isotherm Model Based on a Statistical Mechanics Approach
✍ Scribed by Milton Silva da Rocha; Koshun Iha; Antonio Cândido Faleiros; Evaldo José Corat; Maria Encarnación Vázquez Suárez-Iha
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 120 KB
- Volume
- 208
- Category
- Article
- ISSN
- 0021-9797
No coin nor oath required. For personal study only.
✦ Synopsis
The fundamental integral equation for isotherms derived from statistical mechanics was applied to the analysis of adsorption under low concentrations (or pressures). The model considers adsorption on an energetically heterogeneous surface characterized by an energy distribution function in the semiexponential form N(Q) = (m/RT)e-mQ/RT and by the individual adsorption of each site obeying the Langmuir isotherm. The expression derived guarantees a linear relationship of the covering degree, q, and the concentration, C, that is, q = HC (Henry's law), under the condition of low values of concentration. In this derivation H = mb0/(m - 1) is Henry's constant, while m > 1 and b0 are parameters to be adjusted to experimental data. Copyright 1998 Academic Press.