Investigation of the sorption activity of native coals to air oxygen

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The influence of the gaseous medium during sample preparation, the granulometric composition, the duration of contact with air and the stage of metamorphism on the process of oxygen sorption from the air was established. It is shown that conducting sample preparation in an air atmosphere leads to primary oxidation of the outer surface of the coals, which introduces an error in determining the oxygen sorption rate constant. Fine coal fractions (0-0.2 mm) with a more developed outer surface have increased oxygen absorption activity. The rate of oxygen sorption is maximal at the initial moment of the interaction of active carbons with air and decreases with the duration of contact. The least metamorphosed hard coals of the D brand with a high content of reactive functional groups and a developed porous structure are characterized by the greatest chemisorption activity.

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Sobre autores

Yu. Patrakov

Federal research center of coal and coal chemistry, Siberian branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: yupat52@gmail.com

Institute of coal SB RAS

Rússia, Kemerovo, 650065

S. Semenova

Federal research center of coal and coal chemistry, Siberian branch of the Russian Academy of Sciences

Email: semlight@mail.ru

Institute of coal SB RAS

Rússia, Kemerovo, 650065

A. Yarkova

Federal research center of coal and coal chemistry, Siberian branch of the Russian Academy of Sciences

Email: nas.yarkova1998@yandex.ru

Institute of coal SB RAS

Rússia, Kemerovo, 650065

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2. Fig. 1. Change in oxygen sorption rate for D and W grade coals during sample preparation in air (1) and nitrogen (2) media.

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3. Fig. 2. The effect of particle size on the change in oxygen sorption rate using the example of grade D coal.

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4. Fig. 3. Change in the specific surface area of SBET depending on the size of coal particles [9].

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5. Fig. 4. Dynamics of time changes in the rate of oxygen sorption (a) and the amount of released reaction gases CO2 (b), CO (c) and H2 (d) for coals of grades D, GJ and J.

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6. 5. The dependence of the oxygen sorption rate (a), specific surface area (b), and the content of functional oxygen groups (c) on the degree of coal metamorphism.

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