Results 241 to 250 of about 469,716 (286)
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Journal of the Society of Chemical Industry, 1949
AbstractThe paper draws attention to the importance of the part played by peroxidic bodies or active oxygen in the weathering of coal; comparative investigations have been made with both coal and carbon, which are shown to behave similarly.The initial reaction appears to involve chemisorption, which, in the presence of water, is followed by the ...
R. E. Jones, D. T. A. Townend
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AbstractThe paper draws attention to the importance of the part played by peroxidic bodies or active oxygen in the weathering of coal; comparative investigations have been made with both coal and carbon, which are shown to behave similarly.The initial reaction appears to involve chemisorption, which, in the presence of water, is followed by the ...
R. E. Jones, D. T. A. Townend
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On the kinetics of coal oxidation
AIChE Journal, 1979AbstractA series of seven coals of different ranks and from various locations were heated in air under relatively mild conditions to measure the rates of oxidation and the production of carbonic gases in the effluent stream. The gas flow rate, coal particle size, and reactor temperature were changed as independent variables. Each sample was exposed for
N. L. Avison +2 more
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Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, 1988
Coals contain considerable amounts of oxygen in their structures ranging from 30% in brown coal to about 1.5% in anthracites. The distribution of coal oxygen in various functionalities changes drastically with increasing rank. The hetero-atom functionalities in coal and coal products are of importance in the processing of coal.
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Coals contain considerable amounts of oxygen in their structures ranging from 30% in brown coal to about 1.5% in anthracites. The distribution of coal oxygen in various functionalities changes drastically with increasing rank. The hetero-atom functionalities in coal and coal products are of importance in the processing of coal.
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Mechanism of the Oxidation of Coal
Nature, 1945IT is well understood that the mechanisms of the oxidation of oils1, the curing of rubber2, the polymerization of unsaturated compounds3, the overall combustion of higher hydrocarbons4, as well as of certain biological processes5, involve the formation of peroxidic bodies sometimes initiating chain reactions. Little attention has been directed hitherto
R. E. JONES, D. T. A. TOWNEND
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Thermochemistry of coal oxidation
Thermochimica Acta, 1985Five types of Polish bituminous coal of different grades were analysed using, simultaneously, thermogravimetric analysis (TGA), differential thermogravimetry (DTG), differential thermal analysis (DTA) and evolving gas analysis (EGA) to investigate the non-isothermal coal oxidation.
M.S. Matyjaszczyk, R. Przeliorz
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Oxidative Desulfurization of Coal
1977Both pyritic and organic sulfur in coal can be removed by a variety of oxidation techniques, including treatment with NO/sub x/, peroxygen compounds, air in the presence of specific organic media, or air and water at elevated temperature and pressure.
SIDNEY FRIEDMAN +2 more
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Coal weathering and laboratory (artificial) coal oxidation
International Journal of Coal Geology, 2017Abstract Coal weathering and laboratory (artificial) oxidation have been topics of much discussion and extensive research since over a century ago, as they cause a profound effect on the chemistry of coal and its technological properties and as they induce distinct and irreversible changes to coal macromolecular structure.
Jolanta Kus +2 more
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Effects of Coal Oxidation on Calorific Value
Energy Sources, 1999A brief investigation of the effects of oxidation on the calorific values of three Turkish lignite samples has been made. The lignite samples have been vacuum dried and oxidized in pure oxygen at 35, 45, and 55 C at 100 kPa for 10 days. The calorific values of the oxidized and unoxidized samples have been measured.
Piskin, S, Unal, S, Yalcin, ZG
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Economic Geology, 1958
To determine the effect of weathering on their optical properties, coals have been oxidized by two different methods under controlled conditions. No significant change in reflectance or in petrological composition has been found. The results should prove useful from the point of view of economic geology because from the study of reflectance of a sample
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To determine the effect of weathering on their optical properties, coals have been oxidized by two different methods under controlled conditions. No significant change in reflectance or in petrological composition has been found. The results should prove useful from the point of view of economic geology because from the study of reflectance of a sample
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Coking of coal batch with different content of oxidized coal
Coke and Chemistry, 2012The use of oxidized coal in coking batch increases the analytical moisture content and packing density; impairs the plasticity and ductility; reduces the carbon and hydrogen content; increases the oxygen content; reduces the gross coke yield and the yield of tar, benzene, and unsaturated compounds; increases the yield of carbon dioxide, pyrogenetic tar,
D. V. Miroshnichenko +4 more
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