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 ┼ngstroms 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 ┼.