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Effect of manganese addition to Ni-Cu oxides on properties and activity in the oxidation of volatile organic compounds
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SYSNO ASEP 0578749 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of manganese addition to Ni-Cu oxides on properties and activity in the oxidation of volatile organic compounds Author(s) Jirátová, Květa (UCHP-M) RID, ORCID, SAI
Babii, T. (CZ)
Balabánová, Jana (UCHP-M) RID, ORCID, SAI
Koštejn, Martin (UCHP-M) RID, SAI, ORCID
Maixner, J. (CZ)
Topka, Pavel (UCHP-M) RID, ORCID, SAI
Kovanda, F. (CZ)Article number 114463 Source Title Catalysis Today. - : Elsevier - ISSN 0920-5861
Roč. 429, 1 March (2024)Number of pages 12 s. Language eng - English Country NL - Netherlands Keywords volatile organic compounds ; total catalytic oxidation ; Ni-Cu-Mn oxide catalyst OECD category Chemical process engineering R&D Projects GA21-04477S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access with time embargo (02.03.2026) Institutional support UCHP-M - RVO:67985858 UT WOS 001166220900001 EID SCOPUS 85178375595 DOI 10.1016/j.cattod.2023.114463 Annotation Transition metal oxides are suitable for the total oxidation of harmful volatile organic compounds. The effect of Mn addition to Ni-Cu oxides was investigated to determine the optimum cation composition for achieving high catalytic performance in the total oxidation of ethanol and toluene, which were chosen as model volatile organic compounds. Single component (Ni, Cu, Mn), binary Ni-Cu, and ternary (Ni-Cu-Mn) oxide catalysts with various Ni:Cu and Ni:Cu:Mn molar ratios were prepared by precipitation of aqueous nitrate solutions followed by calcination at 500 ◦C in air. The catalysts were characterized by AAS, powder XRD, Raman spectroscopy, N2 adsorption, H2-TPR, and XPS spectroscopy. The addition of Mn to Ni-Cu oxides led to the formation of Ni-Cu-Mn
mixed oxides with spinel structure and Ni-Mn mixed oxides (Ni6MnO8, NiMnO3). On the other hand, the Ni-Cu catalysts contained a mixture of NiO and CuO. In the H2-TPR experiments, the Ni-Cu-Mn oxides were reduced at lower temperatures compared to the binary Ni-Cu catalysts. The catalytic performance of Ni-Cu-Mn oxide catalysts was higher than that of the Ni-Cu catalysts. As the Mn concentration increased, the concentration of metal bound oxygen raised, while the concentration of oxygen vacancies slightly decreased. A linear correlation was revealed between the surface concentrations of oxygen vacancies determined by XPS and specific reaction rates in ethanol and toluene oxidation over the Ni-Cu and Ni-Cu-Mn catalysts. For the Ni-Cu-Mn mixed oxides and the mixture of Ni and Cu oxides, a synergistic effect was found in the oxidation of both model compounds.Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2025 Electronic address https://hdl.handle.net/11104/0347657
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