Characterization of porous solids using low pressure VOC adsorption data

In this paper, we present a new experimental procedure which aims at measuring adsorption isotherms and heats of adsorption of VOCs on porous media in the low relative pressure range for temperatures ranging from 30 to 300°C. The results provide the Henry constant and the isosteric heat of adsorption at low coverage. The experimental set up and the experimental procedure are presented as well as a validation of the results in the saturation area of the isotherm on the NaY/Toluene system at 150°C. The first result obtained in the Henry area is presented. This work is a part of a more general study aiming at characterizing efficient adsorbents used for the reduction of the VOCs emissions. This characterization method is based on the determination of the Henry constants at industrial operating temperatures and on the direct measurement of the isosteric heats of adsorption at low coverage.