Abstract
This paper provides a simplified treatment of the method of Walton and LeVan (2003) for the development of energy balances for bidisperse particles in fixed-bed adsorption using thermodynamic paths. When adsorbed-phase enthalpy is properly defined, terms involving reference states cancel out of the energy balance, and only gas-phase heat capacities appear in the equation. Calculations show that adsorbed-phase heat capacities may deviate significantly from gas-phase heat capacities when the isosteric heat has a relatively small temperature dependency. Thus, special attention should be given to the path used to derive the energy balance to avoid inconsistencies in heat capacity definitions.
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