Adsorption isotherms and isosteric enthalpy of adsorption for assorted refrigerants on activated carbons

Abstract

This paper features the adsorption equilibria of refrigerants R134a, R290, R410a, and R507a on microporous activated carbon samples at temperatures between 278 K and 338 K with pressures up to 1.4 MPa. The adsorption isotherm data are obtained by utilizing the constant-volume-variable-pressure (CVVP) approach and analyzed using the Dubinin-Ashtakov (DA) model. The regressed adsorption parameters acquired by using this model produces isotherm curves that agree within 5 % of the experimental results. The concentration- and temperature-dependent enthalpies of adsorption of these pairs are evaluated and presented. © 2012 American Chemical Society.