Illinois and Polish fine coal samples, previously characterized by conventional chemical analyses, have been separated by densimetric centrifugation. Both sink and float fractions have been analyzed by X-ray photoelectron spectroscopy and by adsorption microcalorimetry in contact with water and n-hexane vapors. The surface reactivity of Illinois coals (refractory to oil agglomeration processes) is higher than Polish ones (very easily agglomerable) toward both water and n-hexane. This different behavior has been attributed predominantly to the nature of the surface inorganic sites, having an acidic character in the case of Illinois coal, and a more pronounced basic character in the case of Polish coal.
Surface Reactivity of Coals Toward Water and N-hexane - An Adsorption Microcalorimetric Study
BUSCA, GUIDO;
1992-01-01
Abstract
Illinois and Polish fine coal samples, previously characterized by conventional chemical analyses, have been separated by densimetric centrifugation. Both sink and float fractions have been analyzed by X-ray photoelectron spectroscopy and by adsorption microcalorimetry in contact with water and n-hexane vapors. The surface reactivity of Illinois coals (refractory to oil agglomeration processes) is higher than Polish ones (very easily agglomerable) toward both water and n-hexane. This different behavior has been attributed predominantly to the nature of the surface inorganic sites, having an acidic character in the case of Illinois coal, and a more pronounced basic character in the case of Polish coal.
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