Conclusions
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1.
The width of the anthracite coal ESR signal is proportional to the concentration of the adsorbed paramagnetic gas molecules and, at fixed concentration, increases linearly with a rise in temperature. The sensitivity of the signal to adsorption effects increases with a rise in the temperature of vacuum pyrolysis of the coal.
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2.
Both O2 and NO undergo activated adsorption on anthracite coals, the adsorption proceeding more slowly in the latter case. Determined from line width adsorption isobars, the heats of adsorption of O2 and NO are identical. Bulk diffusion is the limiting step in adsorption on vitrains. The gas distributes itself freely through the body of the fusains, the molecules having to overcome a potential barrier in order to reach adsorption sites.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1450–1455, July, 1979.
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Ravilov, R.G., Shklyaev, A.A., Vasil'eva, L.M. et al. An ESR study of the adsorption of oxygen and nitric oxide on the fusain and vitrain fractions of anthracite coals. Russ Chem Bull 28, 1353–1357 (1979). https://doi.org/10.1007/BF00947294
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DOI: https://doi.org/10.1007/BF00947294