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Kinetics of water vapor adsorption on activated carbon

Lookup NU author(s): Emeritus Professor Mark Thomas

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Abstract

The adsorption of water vapor on a highly microporous carbon derived from the carbonization of coconut shell has been studied. This material was characterized by the adsorption of nitrogen at 77 K and carbon dioxide at 273 K. The micropore size distribution was determined using probe molecule vapors at p/p0 = 0.5 and 301 K. The adsorption and desorption characteristics of water vapor on the activated carbon were investigated over the pressure range 0-2.41 kPa (p/p0 0-0.9) in a static water vapor system. The adsorption and desorption kinetics were studied with different amounts of preadsorbed water for changes in vapor pressure of 0.303 kPa. The adsorption rate constants were also studied for three relative humidities for a dynamic flow system at a constant temperature. In these experiments the changes in vapor pressure were much higher than in the static vapor pressure experiments. The kinetic results for both the static atmosphere and dynamic flow systems are discussed in relation to their relative position on the equilibrium isotherm and the adsorption/desorption mechanism.


Publication metadata

Author(s): Foley NJ, Thomas KM, Forshaw PL, Stanton D, Norman PR

Publication type: Article

Publication status: Published

Journal: Langmuir

Year: 1997

Volume: 13

Issue: 7

Pages: 2083-2089

Print publication date: 02/04/1997

ISSN (print): 0743-7463

ISSN (electronic): 1520-5827

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/la960339s

DOI: 10.1021/la960339s


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