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Adsorption of Ethanol on Activated Carbon

E. Besedová and D. Bobok

Department of Chemical and Biochemical Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-812 37 Bratislava



Received: 3 March 2002

Abstract: Adsorption and desorption equilibria of ethanol were measured on two types of activated carbon: Supersorbon HS4 and Dezorex DB1 at temperatures −10ºC, 0ºC, 10ºC, and 20ºC. Experiments were performed within the range of relative pressures from 0 to 1. The analysis of equilibrium data con rmed adsorbed molecules interactions at lower temperatures and higher adsorbate concentrations. Relatively low values of adsorption heats suggest physical adsorption on homogeneous adsorption surfaces. From the modi ed Dubinin—Astakhov equation was found out the volume of micropores, in which the physical adsorption occurred; for activated carbon Supersorbon HS4 it was 350 cm3 kg−1 and for Dezorex DB1 340 cm3 kg−1. At higher relative pressures, capillary condensation occurred. During adsorption and desorption of ethanol on activated carbon a not signi cant hysteresis was manifested. The starting point of this hysteresis, at which capillary condensation of ethanol started, was estimated: AGr = 4.6 kJ mol−1, which corresponds to the values p/Ps from 0.12 to 0.15 at −10ºC to 20ºC for both activated carbons Supersorbon HS4 and Dezorex DB1.

Full paper in Portable Document Format: 571a27.pdf


Chemical Papers 57 (1) 27–34 (2003)

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