Ti-Supported Oxide Coatings Based on MWO4 (M = Fe, Co, Ni): Plasma Electrolytic Synthesis, Characterization and Catalytic Properties in S, N-Heterocycles Peroxide Oxidation

Tarkhanova, I.G.; Zelikman, V.M.; Lukiyanchuk, I.V.; Vasilyeva, M.S.; Tkachev, V.V.; Korochentsev, V.V.; Shlyk, D.H.

Авторы: Tarkhanova Irina G., Zelikman Vladimir M., Lukiyanchuk Irina V., Vasilyeva Marina S., Tkachev Vladimir V., Korochentsev Vladimir V., Shlyk Daria H.
Журнал: Molecules
Том: 30
Номер: 9
Год издания: 2025
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 1998
DOI: 10.3390/molecules30091998
Аннотация: In this study, catalytically active coatings on titanium were synthesized by plasma electrolytic oxidation (PEO) in aqueous electrolytes based on sodium tungstate with the addition of sodium phosphate or sodium borate and chelate complexes of iron, cobalt or nickel. Taking into account the EDX, XPS and XRD data, the oxide–phosphate coatings (PWFe, PWCo, PWNi) contained crystalline titanium oxide and amorphous tungstates and/or phosphates of iron triad metals. Amorphization was facilitated by high phosphorus concentrations (up to 6 at.%). Replacing phosphate with borate in the electrolyte with Ni(II)-EDTA complexes led to the crystallization of WO3 and NiWO4 in the PEO coatings (BWNi). All formed PEO coatings were active in reactions of the oxidative desulfurization (ODS) of thiophene and dibenzothiophene and oxidative denitrogenation (ODN) of pyridine, as well as in the simultaneous removal of S- and N-containing substrates from their mixture. The stability of samples with MWO4 increased in the following series: PWNi < PWCo < PW < PWFe < BWNi. Replacing phosphate with borate in the electrolyte resulted in the preparation of catalysts with enhanced stability and activity. In contrast to PWM catalysts, the BWNi catalyst had selectivity toward the oxidation of pyridine in its mixture with thiophene.
Добавил в систему: Тарханова Ирина Геннадиевна

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Ti-Supported Oxide Coatings Based on MWO4 (M = Fe, Co, Ni): Plasma Electrolytic Synthesis, Characterization and Catalytic Properties in S, N-Heterocycles Peroxide Oxidationстатья

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