Micropore structure of coal

✍ Scribed by Y. Toda; M. Hatami; S. Toyoda; Y. Yoshida; H. Honda

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 704 KB
• Volume: 50
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(71)90008-1

✦ Synopsis

The adsorption of carbon dioxide at 298K, 273K and 253K 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 298K. 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.