Predicting surface diffusivities of molecules from equilibrium adsorption isotherms

Sean P Rigby

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

For SO2 adsorbed upon a variety of different surfaces, both the characteristic heat of adsorption and the activation energy for surface diffusion are predominantly detd. by the surface geometry of the substrate. A previously proposed [S.P. Rigby, 2002] fractal theory for the surface diffusion of mols. on heterogeneous surfaces was expanded and applied to past literature data on the surface diffusion of SO2 upon silica, porous glass, and carbon. The theor. predictions were found to be in line with the exptl. results. The Arrhenius parameters for the surface diffusivity, at a monolayer coverage, are functions of the surface fractal dimension, as obtained by gas adsorption. The compensation effect predicted by the theory was also obsd. These findings suggest that once the relevant model parameters were detd. for the particular chem. species, the surface diffusivity at a monolayer coverage on a given surface may be detd. from an equil. gas adsorption isotherm. The theory also allows the appropriate tortuosity factor to be calcd. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)139-149
Number of pages11
JournalColloids and Surfaces, A: Physicochemical and Engineering Aspects
Volume262
Issue number1-3
Publication statusPublished - 2005

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Adsorption isotherms
diffusivity
isotherms
Molecules
adsorption
surface diffusion
Surface diffusion
molecules
Gas adsorption
fractals
Monolayers
surface geometry
gases
Fractal dimension
Silicon Dioxide
Fractals
activation energy
silicon dioxide
Carbon
Activation energy

Keywords

  • sulfur dioxide adsorbed monolayer surface diffusion calcn
  • Glass Role
  • predicting surface diffusivities of mols. from equil. adsorption isotherms)
  • PROC (Process) (porous
  • Adsorbed monolayers
  • adsorbed monolayer surface diffusion calcn adsorption isotherm
  • Adsorption (isotherm
  • adsorbent
  • Diffusion (surface
  • PYP (Physical process)
  • Fractals (of surface
  • PEP (Physical
  • Simulation and Modeling (predicting surface diffusivities of mols. from equil. adsorption isotherms)
  • engineering or chemical process)

Cite this

Predicting surface diffusivities of molecules from equilibrium adsorption isotherms. / Rigby, Sean P.

In: Colloids and Surfaces, A: Physicochemical and Engineering Aspects, Vol. 262, No. 1-3, 2005, p. 139-149.

Research output: Contribution to journalArticle

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AB - For SO2 adsorbed upon a variety of different surfaces, both the characteristic heat of adsorption and the activation energy for surface diffusion are predominantly detd. by the surface geometry of the substrate. A previously proposed [S.P. Rigby, 2002] fractal theory for the surface diffusion of mols. on heterogeneous surfaces was expanded and applied to past literature data on the surface diffusion of SO2 upon silica, porous glass, and carbon. The theor. predictions were found to be in line with the exptl. results. The Arrhenius parameters for the surface diffusivity, at a monolayer coverage, are functions of the surface fractal dimension, as obtained by gas adsorption. The compensation effect predicted by the theory was also obsd. These findings suggest that once the relevant model parameters were detd. for the particular chem. species, the surface diffusivity at a monolayer coverage on a given surface may be detd. from an equil. gas adsorption isotherm. The theory also allows the appropriate tortuosity factor to be calcd. [on SciFinder (R)]

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