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Adsorption

, Volume 19, Issue 6, pp 1165–1180 | Cite as

Capacity and kinetic measurements of methane and nitrogen adsorption on H+-mordenite at 243–303 K and pressures to 900 kPa using a dynamic column breakthrough apparatus

  • Thomas L. H. Saleman
  • Guillaume C. Y. Watson
  • Thomas E. Rufford
  • Paul S. Hofman
  • K. Ida Chan
  • Eric F. May
Article

Abstract

A dynamic column breakthrough (DCB) apparatus was used to measure the capacity and kinetics of CH4 and N2 adsorption on zeolite H+-mordenite at temperatures in the range 243.8–302.9 K and pressures up to 903 kPa. Equilibrium adsorption capacities of pure CH4 and pure N2 were determined by these dynamic experiments and Langmuir isotherm models were regressed to these pure fluid data over the ranges of temperature and pressure measured. A linear driving force-based model of adsorption in a fixed bed was developed to extract the mass transfer coefficients (MTCs) for CH4 and N2 from the pure gas experimental data. The MTCs determined from single adsorbate experiments were used to successfully predict the component breakthroughs for experiments with equimolar CH4 + N2 gas mixtures in the DCB apparatus. The MTC of CH4 on H+-mordenite at 902 kPa was 0.013 s−1 at 302.9 K and 0.004 s−1 at 243.6 K. The MTC of N2 on H+-mordenite at 902 kPa was 0.011 s−1 at 302.9 K and 0.005 s−1 at 243.5 K. The values of the MTCs measured for each gas at a constant feed gas flow rate were observed to increase in a linear trend with the inverse of pressure. However, the apparent MTCs obtained at the lowest pressures studied (≈105 kPa) were systematically below this linear trend, because of the slightly longer residence time of helium in the mass spectrometer used to monitor effluent composition. Nevertheless, the pure fluid dynamic breakthrough data at these lowest pressures could still be reasonably well described using MTC values estimated from the linear trend. Furthermore, the results of dynamic breakthrough experiments with mixtures were all reliably predicted using the capacity and MTC correlations developed for the pure fluids.

Keywords

Zeolite Pressure swing adsorption Mass transfer coefficient Linear driving force model Langmuir isotherm Natural gas 

Notes

Acknowledgments

The research was funded by Chevron Energy Technology Company, the Western Australian Energy Research Alliance and the Australian Research Council (Project LP0776928). We thank Craig Grimm for helping to construct the apparatus, as well as David Zhang for his contribution to the research.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Thomas L. H. Saleman
    • 1
  • Guillaume C. Y. Watson
    • 1
  • Thomas E. Rufford
    • 1
  • Paul S. Hofman
    • 1
  • K. Ida Chan
    • 2
  • Eric F. May
    • 1
  1. 1.Centre for Energy, School of Mechanical and Chemical EngineeringThe University of Western AustraliaCrawleyAustralia
  2. 2.Chevron Energy Technology CompanyHoustonUSA

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