STUDY OF WATER VAPOR SORPTION BY SAMPLES OF COAL AND PETROLEUM COKE
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Abstract
The article presents the results of a study of the elemental composition and properties of coal, high-sulfur petroleum coke, and a mixture of petroleum coke with 30% by weight of polyethylene terephthalate (PET) activated in a nitrogen stream at (500±1) °C. Thermogravimetric analysis data for the samples, are presented. It is shown, that the introduction of PET into petroleum coke, followed by activation of the mixture, changes the nature of its thermal stability, adding a stage of endothermic destruction of the polymer to the mid-temperature region. Water vapor adsorption/ desorption isotherms at 20 °C (p0 = 2,317 kPa) are presented for the studied samples. It was established, that the studied petroleum coke has a low sorption capacity with respect to water vapor. Coal has a high specific surface area according to the BET method and water vapor adsorption energy. The activated mixture of petroleum coke and PET has a higher specific surface area according to the Langmuir method, but a low water vapor adsorption energy. This indicates low polarity of the sample surface and facilitates monomolecular sorption of water molecules.
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References
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