First principles models of the interactions of methane and carbon dioxide

Mark T. Oakley, Hainam Do, Richard J. Wheatley

Research output: Journal PublicationArticlepeer-review

17 Citations (Scopus)


We present ab initio calculations on the CH4-CH4 and CH4-CO2 dimer potential energy surfaces. We show that the fit to these surfaces is improved over the Lennard-Jones potential by changing the form of the repulsive wall. Ab initio calculations are also performed on trimers to evaluate the strength of nonadditive interactions. The experimental CH4 phase properties are reproduced in simulations that include correction for nonadditive dispersion. The phase-coexistence curve of mixtures of CH4 and CO2 is also improved by including this nonadditive dispersion term.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalFluid Phase Equilibria
Issue number1-2
Publication statusPublished - 25 Mar 2010
Externally publishedYes


  • Ab initio calculations
  • Gibbs ensemble
  • Potential energy surface
  • Vapor-liquid equilibrium

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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