WITTROCK, C and KOHLER, HH (1993) THERMODYNAMIC RELATIONS FOR THE NONCALORIMETRICAL DETERMINATION OF THE HEAT OF ADSORPTION IN MULTICOMPONENT SYSTEMS. JOURNAL OF PHYSICAL CHEMISTRY, 97 (29). pp. 7730-7735. ISSN 0022-3654,
Full text not available from this repository.Abstract
The molar heat of adsorption, DELTAh(ad), of a single solute in ideal dilute solution can be determined indirectly from the temperature dependence of the adsorption isotherm by means of the so-called Clausius-Clapeyron equation. The present paper deals with the generalization of this equation to systems with several adsorbing components. The generalization must allow for the nonstoichiometry of the adsorption process; that is for the fact that, in general, the amounts of the adsorbing substances exchanged between the bulk phase and the surface phase are not coupled by constant ratios. Instead, these ratios change with the composition of the bulk solution. These changes can be represented by a path P in the space of the bulk solute concentrations. To make the value of the differential molar heat of adsorption unique, it must be related to this path P, which leads to the definition of a corresponding heat DELTAh1,P.(ad). With use of this definition the Clausius-Clapeyron equation is generalized on the level of the individual components as well as on the level of the adsorption process as a whole. The latter approach turns out to be much more fruitful for practical applications. Several examples are discussed in detail.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53878 |
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