Synthesis, Mössbauer study and catalytic properties of Cu-Ni-Fe- oxide/nitride mixed-phase materials
| Autor: | Radostina Ivanova, Tanya Petrova, Nikolay Velinov, A. Eliyas, Tanya Tsoncheva, Daniela Kovacheva, Ivan Mitov |
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| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Materials science catalysis Mössbauer spectroscopy Inorganic chemistry Oxide copper-nickel ferrites chemistry.chemical_element Quadrupole splitting Nitride Condensed Matter Physics photocatalytic water purification Nitrogen Atomic and Molecular Physics and Optics Catalysis chemistry.chemical_compound Physisorption chemistry methanol decomposition Phase (matter) iron-nickel nitrides Physical and Theoretical Chemistry |
| Zdroj: | Hyperfine Interactions. 242 |
| ISSN: | 1572-9540 0304-3843 |
| DOI: | 10.1007/s10751-021-01742-6 |
| Popis: | Materials with cation ratio Cu:Ni:Fe = 0.5:0.5:2 were prepared by sol-gel auto-combustion technique using corresponding metal nitrates and citric acid as complexating/fuel agent and ammonia for pH adjustment. For comparison, one sample was synthesised by the same method, but without pH adjustment, and one sample with nominal composition Cu0.5Ni0.5Fe2O4 was synthesised by co-precipitation method. The methods of X-Ray Diffraction, Mossbauer spectroscopy at room (RT) and liquid nitrogen (LNT) temperature, UV-Vis, FTIR, nitrogen physisorption, and H2-TPR were applied for structural characterization of the materials. X-Ray Diffraction and Mossbauer spectroscopy proved formation of spinel phase, Fe4-xNixN and minor quantity CuO phase. Presence of doublets with high quadrupole splitting (Δ = 1.02–1.07 mm/s) at RT Mossbauer spectra, which are partly preserved at LNT is evidenced that nitride phase has high nickel content. Specific surface of oxide/nitride samples was determined in the range 19–24 m2/g. The catalytic behaviour of the Cu-Ni-Fe- oxide/nitride materials is studied in reaction of methanol decomposition. Mossbauer spectra reveal significant phase transformations of the samples to Hagg carbide (χ-Fe5C2) and Fe,Ni-alloy under the reaction medium, which ensures good catalytic activity and selectivity to H2 and CO. The photocatalytic oxidation activity of samples was tested in degradation of Alizarin model contaminant dissolved in water under visible light and UV-C light irradiation. |
| Databáze: | OpenAIRE |
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