2409.     NAY, M. A., AND MORRISON, J. L.  Molecular Adsorption Areas of Hydrocarbon Gases on Charcoal.  Canadian Jour. Research, vol. 27, B, No. 4, 1949, pp. 205-214.

        Low-temperature adsorptions of CH₄, C₂H₆, C₃H₈, n-C₄H₁₀, iso-C₄H₁₀, C₂H₂, C₂H₄, and N₂ on a series of coconut charcoals of different degrees of activation were determined.  Langmuir isotherms were obtained in every case.  The measurements indicate horizontal orientation of the hydrocarbon molecules on the charcoal surface.  By comparing the maximum number of millimoles adsorbed for each gas on each charcoal with the respective maximum number of millimoles of N₂ adsorbed, and by assuming a molecular adsorption area of 16.2 square Ångstroms for N₂, the following average molecular adsorption areas were obtained:  CH₄, 19.4; C₂H₆, 25.9; C₃H₈, 36.0; n-C₄H₁₀, 42.1; iso-C₄H₁₀, 47.4; C₂H₂, 19.8; and C₂H₄, 23.1 square Å.