Authors: I.O. Krylov, A.A. Lavrinenko

Title of the article: Influence of the surface structure of shungite rock on its catalytic properties

Year: 2022, Issue: 5, Pages: 30-39

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 553.983, 553.087, 544.478.12

DOI: 10.26730/1999-4125-2022-5-30-39

Abstract: The article substantiates the reasons for the catalytic activity of shungite rock of the 3rd variety of the Zazhoginsky deposit in hydrocarbon conversion reactions associated with the structure of its initial surface after crushing, modified by high-temperature calcination in atmospheric air and leaching with a weak acid solution. The aspects of the structure affecting the catalytic activity and the varieties of catalytic active centers existing (available) in the initial shungite rock and arising in the process of modifications are shown. Experimental data proving the difference between the chemical and mineral composition of the newly formed surface during crushing and grinding, as well as as a result of modification by thermal and acidic methods, are presented. The change in the electron beam power during X-ray spectral fluorescence analysis made it possible to see the difference in the chemical composition of the deep layers of the studied samples of shungite rock and its modifications and surface. The methods of electron microscopic studies revealed a significant difference in the structural and textural features of the original shungite rock, thermomodified and modified, obtained by water-acid leaching. The catalytic activity of hydrocarbon conversion, which makes it possible to increase the octane number of motor fuel, is associated with the presence on the grain surface of an increased density of active centers, both of the initial shungite rock and its modifications differing in physicochemical properties.

Key words: shungite rock modification catalytic properties carbon grain surface layer active centers

Receiving date: 15.09.2022

Approval date: 01.10.2022

Publication date: 18.10.2022

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