THE THEORETICAL CALCULATION OF THE HEAT OF ADSORPTION FOR GASES PHYSICALLY ADSORBED ON CARBON SURFACES

Technical Report · Mon Sep 28 04:00:00 EDT 1959

DOI:https://doi.org/10.2172/4211520· OSTI ID:4211520

Pace, E L

The results of theoretical computations of the differential heat of adsorption for the low boiling gases, nitrogen, argon neon, orthodeuterium, parahydrogen and helium (He/sup 4/), adsorbed on a graphite surface are compared with the experimental values which have been observed for these gases adsorbed on finely divided graphitic surfaces. The role of the zero point energy in the heat of adsorption is discussed. In the case of parahydrogen and orthodeuterium, the difference in the zero point energies arising from the difference in masses accounts satisfactorily for the higher heat of adsorption observed for orthodeuterium. The effect of energy barriers in the surface on the heat of adsorption is considered. For the particular case of a graphitic sunface, it is shown that the energy barriers are small, and therefore, a liquid like'' behavior is reasonable for the adsorbed layers. With this behavior as a basis, an application of simple lattice-liquid theory for the characterizing of the differential heat of adsorption on a graphitic surface for surface coverage to approximately two monolayers is carried out. (auth)

• Research Organization: Western Reserve Univ., Cleveland
• NSA Number: NSA-13-022643
• OSTI ID: 4211520
• Report Number(s): NYO-4884
• Country of Publication: United States
• Language: English

Related Subjects

ABSOLUTE ZERO TEMPERATURE
ADSORPTION
ADSORPTION HEAT
ARGON
BARRIERS
CARBON
DEUTERIUM
DEUTERIUM-ORTHO
ENERGY
GASES
GRAPHITE
HELIUM 4
HYDROGEN
HYDROGEN-PARA
ISOMERS
LAYERS
LIQUIDS
LOW TEMPERATURE
MASS
NITROGEN
NUMERICALS
PHYSICS AND MATHEMATICS
SURFACES
THERMODYNAMICS