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Datong coal has high flotability and Illinois coal has low flotability. They were used to study flotability with respect to evaluation of the critical wetting surface tension (yc) of each coal particle. When the flotability of coal particles having the same yc value was compared between Datong and Illinois coal, Datong coal notability was greater than that of Illinois coal. It was suggested that the heterogeneous distribution of hydrophobic strength on a surface of each coal particle should be taken into account to understand the attachment of a bubble to a coal particle.
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NiMo sulfide catalysts were supported well with ultrafine hollow particles of a particular carbon black (Ketjen Black: KB). This catalyst exhibited an excellent activity for coal liquefaction and can be recovered from the liquefaction residue for recycling. The high activity is ascribed to the highl
09 Combustion (burners, combustion systems) 98100548 Experimental and numerical assessment of NO, reduction and char burnout of various South African utility feedstocks Fortsch. D. er al. VDI-Ber., 1997, 1313, (Verbrennung und Feuerungen), 21-26. Five South African domestic coals were investigated w
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