Abstract
Surface properties of the chars obtained from two Australian coals at different temperature of 200-290 o C were characterized by means of high-pressure mercury porosimetry, adsorption of CO 2 (0 o C), CH 3 OH (25 o C), and H 2 O-immersional microcalorimetry at 25 o C. With increasing temperatures of char preparation, the volume of macropores in a diameter range of 50nm-10μm increased with a maximum at 600 o C, while the amounts of CO 2 , CH 3 OH, and H 2 O adsorbed, depending on the micro- and mesoporosity of char, changed with a minimum at a temperature (400-600 o C) dependent on the nature of coal. In contrast, surface hydrophilicity of char, estimated from the specific immersional heat of char into water, monotonously decreased with increasing temperatures of char preparation from 200 to 750 o C
Published Version
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