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Adsorption and desorption kinetics of n-octane and n-nonane vapors on activated carbon

Lookup NU author(s): Dr Ashleigh Fletcher, Emeritus Professor Mark Thomas

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Abstract

This investigation has involved the study of the adsorption and desorption kinetics of two n-alkanes on a wood-based active carbon (BAX950). The adsorption and desorption characteristics of n-octane vapor on the activated carbon were investigated over the relative pressure (p/p0) range 0-0.97 for temperatures in the range 288-313 K in a static vapor system. The adsorption characteristics of n-nonane were studied over the relative pressure range 0-0.97 and temperature range 303-323 K. The adsorption and desorption kinetics were studied with different amounts of preadsorbed n-octane for set changes in relative vapor pressure (p/p0). The desorption kinetics were much slower than the corresponding adsorption kinetics for the same pressure step. The rate constants for adsorption increased with increasing relative pressure and surface coverage. The kinetic data for adsorption were used to calculate the activation energies for each increase in relative pressure. The activation energy was highest at low p/p0 and decreased with increasing p/p0 until a maximum was reached at p/p0 to approximately 0.075. n-Nonane adsorption showed similar trends in adsorption kinetics and activation energies to the n-octane adsorption. The results are discussed in terms of diffusion in the pore structure in relation to the adsorption isotherm and mechanism.


Publication metadata

Author(s): Fletcher AJ, Thomas KM

Publication type: Article

Publication status: Published

Journal: Langmuir

Year: 1999

Volume: 15

Issue: 20

Pages: 6908-6914

Print publication date: 28/09/1999

ISSN (print): 0743-7463

ISSN (electronic): 1520-5827

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/la9814992

DOI: 10.1021/la9814992


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