Abstract
Abstract The adsorption of carbon dioxide at 298 K, 273 K and 253 K by the vitrains of twelve Japanese coals and five foreign coals has been studied. The Dubinin-Polanyi equation was used in order to interpret the isotherms. Equilibrium points at different temperatures fell satisfactorily on a single straight line of the Dubinin-Polanyi equation. It was shown that it is possible to estimate the differential heat of adsorption of these coals from an isotherm obtained at a single temperature if the isotherm follows the Dubinin-Polanyi equation. The heats of adsorption of carbon dioxide on coals amounted to 6–7.5 kcal/mol regardless of rank. The rate of adsorption of carbon dioxide on coals was measured at a constant pressure of 260 mmHg at 298 K. The micropore volume, the gradient of the Dubinin plot and the rate of adsorption are discussed in relation to characteristics of their infra-red adsorption spectra. It is concluded that the micropore structure of coal is closely related to the number of hydrogen atoms bound directly to carbon atoms. A possible explanation of this is suggested.
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