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- W69297243 abstract "Three subbituminous coals and one MVB coal were pyrolyzed in a nitrogen atmosphere to 900/sup 0/C. The pyrolyzed residues were reacted with oxygen and steam. The rate of reaction was followed gravimetrically using a thermobalance. The particle size of the sample was (40 x 80) mesh and the bed height was about one particle diameter. Reaction with air was followed at four temperatures in the range 400 to 600/sup 0/C. After an induction period the weight loss was linear with time for an extended burn-off range. The rate of reaction was obtained from the linear region and was found to increase with a decrease in the rank of the parent coal. The temperature coefficient of the rate was low. The slope of the Arrhenius plots decreased with increasing temperature and attained a value of approximately 15 Kcal/mole for chars in the temperature interval between 500 to 550/sup 0/C. A similar decrease in the slope of the plot for the coke was observed at approximately 50/sup 0/C higher temperature. Reaction with 2.3 vol percent of steam was followed with the same samples in the temperature range 800 to 900/sup 0/C. Induction periods for the reaction with steam were very short ormore » nonexistent. The reaction rate was zero order with respect to carbon for an extended burn-off region. The temperature coefficient of the rate (approximately 30 Kcal/mole for the chars) tends to indicate that the rate was pore-diffusion-controlled and suggests that a possible catalytic effect due to the mineral content of the chars may have been operative.« less" @default.
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- W69297243 date "1975-01-01" @default.
- W69297243 modified "2023-09-24" @default.
- W69297243 title "Rate of reaction of oxygen and steam with char/coke. [5 refs. ; 400--600/sup 0/C]" @default.
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