Effect of manganese addition to Ni-Cu oxides on properties and activity in the oxidation of volatile organic compounds

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 wer...

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Veröffentlicht in:Catalysis today Jg. 429; S. 114463
Hauptverfasser: Jirátová, Květa, Babii, Timur, Balabánová, Jana, Koštejn, Martin, Maixner, Jaroslav, Topka, Pavel, Kovanda, František
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier B.V 01.03.2024
Schlagworte:
Ethanol oxidation
Ni-Cu-Mn oxide catalysts
Toluene oxidation
Total catalytic oxidation
Volatile organic compounds
Volatile organic compounds
Ethanol oxidation
Toluene oxidation
Total catalytic oxidation
Ni-Cu-Mn oxide catalysts
ISSN:0920-5861, 1873-4308
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Zusammenfassung: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. [Display omitted] •Binary Ni-Cu and ternary Ni-Cu-Mn oxide catalysts were prepared.•The addition of Mn to Ni-Cu oxides led to the formation of mixed Ni-Cu-Mn oxides.•Catalytic activity of Ni-Cu-Mn oxides higher than that of Ni-Cu oxides.•Concentration of oxygen vacancies correlated with oxidation reaction rates.•Synergistic effect observed for Ni-Cu-Mn and Ni-Cu oxides.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2023.114463