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Simultaneous determination of mass and calorimetric adsorption data of volatile organic compounds on microporous media in the low relative pressure range

In this paper, we present a new experimental procedure which aims at measuring adsorption isotherms and heats of adsorption of volatile organic compounds (VOCs) on porous media in the low relative pressure range for temperatures ranging from 303 to 573 K. The experimental set-up and the experimental dynamic procedure are presented as well as a complete report on the treatment of the rough experimental results to obtain the adsorption isotherms and the adsorption heat curves. Measurement accuracy and repeatability are given. The maximum measurement error is 3% on the adsorbed mass, 9% on the partial pressure of VOC and 15% on the adsorption heat. Results are provided for a toluene/NaY system (isotherm and adsorption heat curve at 423 K in the pressure range 0.4–2000 Pa).