Monatomic Gas Adsorption and the Structure of the 5A and 13X Zeolites

Thomas R. Rybolt, Robert L. Mitchell, Chris M. Waters

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The low-coverage, Henry's law, physical adsorption of argon, krypton, and xenon with the 5A and 13X zeolites is represented with a virial equation. The temperature dependence of the second gas-solid virial coefficients is used in conjunction with a Lennard-Jones and Devonshire cell model to determine the energetic and structural parameters which characterize these six gas-solid systems. An integral which includes as parameters the cavity radius, number of cavities, and maximum gas-cavity interaction energy is related to the second gas-solid virial coefficient. An iterative procedure employing numerical integration and requiring no prior knowledge of the zeolite structure is used to find the parameters which best fit available experimental adsorption data. The interaction energies were found to be, for Ar, Kr, and Xe, 12 901,18 404, and 25 555 K and 13 006, 17 157, and 21 754 K for the 5A and 13X systems, respectively. For the 5A and 13X zeolites the mean cavity radii were found to be 0.712 and 0.711 nm, and the number of cavities were calculated to be 1.66 X 1020and 1.55 X 1020 cavities/g, respectively. The cavity radii are in close agreement with X-ray crystallographic values while the number of cavities are within a factor of 2 of the known values.

Original languageEnglish
Pages (from-to)326-331
Number of pages6
Issue number3
StatePublished - May 1 1987

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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