Adsorption and mobility of water and organic molecules in carbonaceous adsorbents. 4. Self-diffusion coefficients of water molecules and organic substances in active carbon having relatively large micropores

The self-diffusion coefficients of water in active carbon (AC) having relatively wide micropores increase in direct proportion to the degree of filling. The self-diffusion coefficients D of adsorbed C₆H₆, C₆F₆, C₆H₁₂, and H₂O molecules at 298 K do not depend on the size of the molecules and are larger, the greater the mobility of the molecules in the free liquids. The self-diffusion activation energy of the adsorbed molecules varies in the order: H₂O>C₆F₆> C₆H₁₂ C₆H₁₄. C₆H₁₄. For H₂O and C₆H₆ the activation energy increases as the characteristic size of the micropores of the AC increases.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1949–1951, September, 1989.