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

A.J. Fletcher, K.M. Thomas

Research output: Contribution to journalArticle

48 Citations (Scopus)

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/p degrees) 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/p degrees). 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/p degrees and decreased with increasing p/p degrees until a maximum was reached at p/p degrees similar to 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.
LanguageEnglish
Pages6908-6914
Number of pages6
JournalLangmuir
Volume15
Issue number20
DOIs
Publication statusPublished - Sep 1999

Fingerprint

nonanes
octanes
activated carbon
Activated carbon
Desorption
desorption
Vapors
vapors
Adsorption
Kinetics
adsorption
kinetics
Activation energy
activation energy
octane
nonane
Alkanes
Pore structure
Vapor pressure
Adsorption isotherms

Keywords

  • adsorption
  • desorption
  • kinetics
  • n-octane
  • n-nonane vapors
  • activated carbon
  • chemical engineering

Cite this

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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/p degrees) 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/p degrees). 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/p degrees and decreased with increasing p/p degrees until a maximum was reached at p/p degrees similar to 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.",
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Adsorption and desorption kinetics of n-octane and n-nonane vapors on activated carbon. / Fletcher, A.J.; Thomas, K.M.

In: Langmuir, Vol. 15, No. 20, 09.1999, p. 6908-6914.

Research output: Contribution to journalArticle

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AU - Thomas, K.M.

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N2 - 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/p degrees) 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/p degrees). 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/p degrees and decreased with increasing p/p degrees until a maximum was reached at p/p degrees similar to 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.

AB - 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/p degrees) 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/p degrees). 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/p degrees and decreased with increasing p/p degrees until a maximum was reached at p/p degrees similar to 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.

KW - adsorption

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