Abstract
The low temperature adsorptions of methane, ethane, propane, normal butane, isobutane, acetylene, ethylene, and nitrogen 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 nitrogen adsorbed, and by assuming a molecular adsorption area of 16.2 Å2 for nitrogen, the following average molecular adsorption areas were obtained: methane—19.4, ethane—25.9, propane—36.0, normal butane—42.1, isobutane—47.4, acetylene—19.8, and ethylene—23.1 Å2.
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