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- W345179450 abstract "Differential scanning calorimetry in conjunction with the thermogravimetric analysis technique has been used to determine quantitatively thermal effects involved during hydrogenation of 21 U.S. raw coals of varying rank at 800 psig and temperatures up to 570/sup 0/C. The heat of hydrogenation decreases with increase in coal rank; exothermic heats vary from 153 cal/g for lignites to 6.9 cal/g for anthracite. Transition temperature, that is the temperature corresponding to the onset of exotherms, is markedly dependent on coal rank, varying from about 250/sup 0/C for lignites to 540/sup 0/C for anthracite. A sharp increase in transition temperature occurs for coals having a carbon content, on a dry-ash-free basis, in the 75 to 80 percent range. In most cases, demineralization of coals decreases the heat of hydrogenation. However, in the case of medium volatile and HVA bituminous coals, exothermic heats increase upon demineralization. There is some indication that pyrite, or pyrrhotite produced during reduction of pyrite, may have a beneficial catalytic effect on coal hydrogenation. Reaction rate constants have been estimated in some cases. In general, demineralization causes a decrease in rate constant and an increase in activation energy for hydrogenation." @default.
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- W345179450 date "1975-01-01" @default.
- W345179450 modified "2023-09-23" @default.
- W345179450 title "Differential scanning calorimetry studies on coal hydrogenation. [4 refs. ; 800 psig; temp. to 570/sup 0/C]" @default.
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