Heats of Adsorption of Polar and Non-Polar Gases in Homogeneous and Heterogeneous Adsorbents

  • J. Dunne
  • R. Mariwala
  • M. Rao
  • S. Sircar
  • R. J. Gorte
  • A. L. Myers
Part of the The Kluwer International Series in Engineering and Computer Science book series (SECS, volume 356)

Abstract

We have designed and constructed a Tian-Calvet type microcalor-imeter for the simultaneous determination of adsorption isotherms and differential heats of adsorption. The adsorption of a series of gases with different values of polarizability, polarity, and molecular diameter has been studied on both homogeneous (silicalite) and heterogeneous (Na-ZSM-5 and NaX) adsorbents. Heats of adsorption of non-polar gases (SF6, C2H6, CH4, O2, Ar) increase in the order NaX < silicalite < Na-ZSM-5; heats of adsorption of polar gases (N2 and CO2) increase in the order silicalite < Na-ZSM-5 < NaX. The heat profiles of the polar gases show a steep decrease with coverage on NaX and Na-ZSM-5 corresponding to the filling of high-energy sites adjacent to sodium cations.

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • J. Dunne
    • 1
  • R. Mariwala
    • 1
  • M. Rao
    • 1
  • S. Sircar
    • 1
  • R. J. Gorte
    • 1
  • A. L. Myers
    • 1
  1. 1.Department of Chemical EngineeringUniversity of PennsylvaniaPhiladelphiaUSA

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