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Acid-Base Properties of Cobalt Ferrite Surface Examined by Different Physicoсhemical Methods

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Abstract—

The acid-base properties of cobalt ferrite synthesized by the mechanochemical method with different ratios of the main components Fe2O3 : Co3O4 have been investigated using the temperature-programmed desorption of ammonia, IR spectroscopy using adsorbed pyridine with ammonia, and the Hammett indicator method. A comparison of the results for the total content of Lewis and Brønsted acid sites by three methods has shown that all three samples were quite similar, with a probability of 0.5%. The introduction of cobalt oxide into the composition of cobalt ferrite leads to an increase in the concentration of Brønsted and Lewis centers with a simultaneous increase in the number of strong basic centers determined by the temperature-programmed desorption of ammonia. The indicator method is the most informative method for a quantitative study of the acid-base properties of the cobalt ferrite surface, since it allows one to assess the concentration and strength of Lewis and Brønsted acid sites and basic sites.

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ACKNOWLEDGMENTS

We thank the Centre for Collective Use at the Ivanovo State University of Chemistry and Technology for providing access to equipment facilities.

Funding

This work was performed within the work plan of the laboratory for the synthesis, investigation, and testing of catalytic and adsorption systems for processing hydrocarbon raw materials (founded with financial support from the Ministry of Education and Science of the Russian Federation for 2012–2022, project no. FZZW-2020-0010). The theoretical part of the work was financially supported by the Scholarship of the President of the Russian Federation (grant no. SP-3800.2019.1).

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Authors and Affiliations

  1. Ivanovo State University of Chemistry and Technology, Ivanovo, Russia

    K. O. Denisova, A. A. Il’in, R. N. Rumyantsev, A. P. Il’in & N. N. Smirnov

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  1. K. O. Denisova
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  2. A. A. Il’in
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  3. R. N. Rumyantsev
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  4. A. P. Il’in
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  5. N. N. Smirnov
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Correspondence to A. A. Il’in.

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Translated by D. Kharitonov

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Denisova, K.O., Il’in, A.A., Rumyantsev, R.N. et al. Acid-Base Properties of Cobalt Ferrite Surface Examined by Different Physicoсhemical Methods. Theor Found Chem Eng 54, 1306–1313 (2020). https://doi.org/10.1134/S0040579520050309

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