Adsorption characteristics of granular activated carbon/HFC-404A has been investigated in terms of
adsorption isotherms and kinetics. AquaSorb 2000 which is bituminous based carbon has been used as
an adsorbent. Experimentally and theoretical investigations have been conducted within temperature
range of 25–75 C. Experimental results have been fitted with Dubinin–Astakhov (D–A) and Tóth
equations for the isotherms and linear driving force and Fickian diffusion models for the kinetics. It
has been reported that maximum adsorption capacity is about 0.52 kg/kg. Activation energy and the
pre-exponential coefficient were estimated to be 10488.49 J/mol and 1.11 respectively. Isosteric heat
of adsorption as a function of relative adsorption capacity with non-ideal consideration has been also
estimated using Clausius–Clapeyron equation and is found to vary from 145 to 330 kJ/kg. Pressure–tem
perature–concentration diagram of the adsorption pair has been also presented.