A study on the kinetics of ethanol-activated carbon fiber: Theory and experiments

Ibrahim I. El-Sharkawy, Bidyut B. Saha, Shigeru Koyama, Kim Choon NG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

An experimental and theoretical study has been conducted on the adsorption kinetics of ethanol onto a pitch-based activated carbon fiber (ACF) of type (A-20). Experiments have been carried out across assorted adsorption temperatures that are useful to the operation of adsorption chillers. The kinetic curve for each isotherm is measured accurately using a thermal-gravimetric analyzer (TGA) from which the diffusion time constant and consequently, the overall mass transfer coefficient could be evaluated. A novel concentration profile, with an exponent parameter k, has been proposed in the theoretical model which accounts for the effect of meso- and micro-pore structures within the ACF. The proposed concentration profile removes the restrictions between the overall mass transfer coefficient and the diffusion time constant. Using the measured kinetics, the numerical value of k is evaluated, leading to a new form of the linear driving force (LDF) model for cylindrical adsorbent that could capture the higher ethanol uptake in ACF and this LDF model has been validated experimentally.

Original languageEnglish (US)
Pages (from-to)3104-3110
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Volume49
Issue number17-18
DOIs
StatePublished - Aug 1 2006

Keywords

  • Activated carbon fiber
  • Adsorption kinetics
  • Diffusion time constant
  • Ethanol
  • Linear driving force model
  • Overall mass transfer coefficient

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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