Reaction Engineering, Kinetics, and Catalysis

Equilibrium and kinetics analysis of carbon dioxide capture using immobilized amine on a mesoporous silica

  1. Esmail R. Monazam1,
  2. Lawrence J. Shadle2,*,
  3. David C. Miller2,
  4. Henry W. Pennline3,
  5. Daniel J. Fauth3,
  6. James S. Hoffman3,
  7. McMahan L. Gray3

Article first published online: 23 JUL 2012

DOI: 10.1002/aic.13870

Issue

AIChE Journal

AIChE Journal

Volume 59, Issue 3, pages 923–935, March 2013

Additional Information

How to Cite

Monazam, E. R., Shadle, L. J., Miller, D. C., Pennline, H. W., Fauth, D. J., Hoffman, J. S. and Gray, M. L. (2013), Equilibrium and kinetics analysis of carbon dioxide capture using immobilized amine on a mesoporous silica. AIChE J., 59: 923–935. doi: 10.1002/aic.13870

Author Information

  1. 1

    National Energy Technology Laboratory, REM Engineering Services, PLLC, Morgantown, WV

  2. 2

    National Energy Technology Laboratory, U. S. Dept. of Energy, Morgantown, WV

  3. 3

    National Energy Technology Laboratory, U. S. Dept. of Energy, Pittsburgh, PA

*Correspondence concerning this article should be addressed to L. J. Shadle at lshadl@netl.doe.gov.

  1. This article is a U.S. Government work and, as such, is in the public domain in the United States of America.

Publication History

  1. Issue published online: 20 FEB 2013
  2. Article first published online: 23 JUL 2012
  3. Accepted manuscript online: 12 JUN 2012 10:18AM EST
  4. Manuscript Revised: 18 MAY 2012
  5. Manuscript Received: 21 DEC 2011

Funded by

  • Department of Energy

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Keywords:

  • adsorption/gas;
  • reaction kinetics;
  • green engineering;
  • environmental;
  • engineering;
  • nucleation

Thermogravimetric analysis is used to study the adsorption kinetics, equilibrium, and thermodynamics of CO2 on immobilized polyethylenimine sorbent impregnated on a mesoporous silica over the range of 300–390 K and 5–100% CO2 concentration. Adsorption isotherm models were fitted to the experimental data indicating that a change in adsorption mechanism occurred near 70°C. Below this temperature, the adsorption data followed the heterogeneous isotherms, while data taken at higher-temperatures followed isotherms for homogeneous surfaces. Heat of sorption was estimated to be 130 kJ/mole for the low-temperature regime, but this decreased to 48 kJ/mole above 70°C. The rate of CO2 fractional uptake decreased as temperature increased. A phenomenological kinetic model was derived from the Weibull distribution function using a nucleation growth theory to describe the two-step process. The kinetic model was used to predict the uptake at different operating conditions and resulted in good agreement with experimental data. Published 2012 American Institute of Chemical Engineers AIChE J, 2013

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