Pore size analysis of activated carbons from argon and nitrogen porosimetry using density functional theory
The authors present isotherms calculated from density functional theory for the adsorption of argon in model slit-shaped carbon pores at 77 K. The model isotherms are used to interpret experimental argon uptake measurements and to obtain the pore size distributions of several porous carbons. A similar set of density measurements and to obtain the pore size distributions of several porous carbons. A similar set of density functional theory isotherms, previously reported for nitrogen adsorption on carbon slit pores at 77 K, are used to determine pore size distributions for the same set of carbons. The pore size distribution maxima, mean pore widths, and specific pore volumes measured using the two different probe gases are all found to agree to within approximately 8% on average. Some of the differences in the pore size distributions obtained from argon and nitrogen porosimetry may be attributable to quadrupolar interactions of the nitrogen molecules with functional groups on the carbon surface.
- Research Organization:
- Michigan State Univ., East Lansing, MI (US)
- OSTI ID:
- 20080288
- Journal Information:
- Langmuir, Vol. 16, Issue 11; Other Information: PBD: 30 May 2000; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diffusion of gases in coals and chars. Technical progress report No. 3, March 15-June 14, 1986
Pore structure analysis of American coals