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Activation of the oxidation and combustion of anthracite by the copper acetate salt additive

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Abstract

The influence of the method of copper acetate additive Cu(OAc)2 introduction on the characteristics of anthracite oxidation and combustion was studied. The additive containing 5 wt.% copper acetate was introduced using the methods of mechanical mixing and incipient wetness impregnation. According to the EDX-mapping data (EDX is energy dispersive X-ray spectroscopy), the incipient wetness impregnation method provides a higher degree of dispersion of the salt additive and its uniform distribution in the anthracite samples. The oxidation, ignition, and combustion parameters of the anthracite samples modified by the salt additives were studied using differential thermal analysis and high-speed video recording in a combustion chamber at a heating medium temperature of 800 °C in gas environment. The use of the copper acetate additive favors an increase in the reactivity of anthracite during combustion as evidenced by a decrease in the combustion onset temperature by 35–190 °C and ignition delay time by 2–5 s. The initial step of anthracite combustion is accompanied by the periodic formation of microexplosions. The introduction of the copper acetate additive induces an average decrease of 70% in the content of the unburnt fuel in the anthracite combustion products and an average decrease in the contents of CO and NOx by 19 and 21%, respectively. A mechanism for the activation of anthracite consumption with the copper acetate salt additive was proposed. The mechanism includes the step of copper acetate thermolysis with the formation of nonstoichiometric copper oxide CuOx, which catalyzes the further oxidation of anthracene.

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Funding

The change in the morphology of anthracite particle upon the addition of the combustion modifier was studied in the framework of state assignment No. 075-00268-20-02 (identifier 0718-2020-0040, theme “Complex Processing of Hydrocarbons with Formation of Hydrogen-containing Gases and Precursors of Composite Materials for Additive Production”).

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Authors and Affiliations

  1. National University of Science and Technology MISIS, 4 Leninsky prosp., 119049, Moscow, Russia

    A. A. Gromov, D. Yu. Ozherelkov, I. A. Pelevin, S. V. Chernyshikhin & A. Yu. Nalivaiko

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  1. A. A. Gromov
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  2. D. Yu. Ozherelkov
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  3. I. A. Pelevin
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  4. S. V. Chernyshikhin
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  5. A. Yu. Nalivaiko
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Correspondence to A. A. Gromov.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2085–2091, October, 2022.

No human or animal subjects were used

The authors declare no competing interests.

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Gromov, A.A., Ozherelkov, D.Y., Pelevin, I.A. et al. Activation of the oxidation and combustion of anthracite by the copper acetate salt additive. Russ Chem Bull 71, 2085–2091 (2022). https://doi.org/10.1007/s11172-022-3630-z

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  • DOI: https://doi.org/10.1007/s11172-022-3630-z

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