from 01.01.2023 until now
Russian Federation
In this study, Ni-Fe oxide catalysts supported on γ-Al₂O₃ were synthesized using the sol-gel method, with the Ni/Fe molar ratio varied (1:1, 20:1, 15:5, 5:15, 1:20). The synthesis process involved preparing a film-forming solution based on butanol, nitric acid, tetraethoxysilane, and metal nitrates, followed by deposition onto γ-Al₂O₃, drying at 100°C, and annealing at 400°C. To investigate the structural, morphological, and textural properties of the resulting materials, X-ray diffraction (XRD), scanning electron microscopy (SEM) with micro-X-ray spectral analysis, and low-temperature nitrogen adsorption were employed. It was found that an equimolar Ni/Fe ratio of 1:1 ensures the formation of a homogeneous mixed oxide phase, uniform distribution of active components across the support surface, and high particle dispersion. Analysis of SEM images reveals a continuous coating free of agglomerates, indicating good adhesion of the catalyst to the support. XRF data confirm the presence of NiO and α-Fe₂O₃ phases, which interact strongly with γ-Al₂O₃, ensuring the stability of the catalytic system. The specific surface area of the catalyst with a Ni/Fe ratio of 1:1, determined by the BET method, is 134.8 m²/g, which is only 3.4% lower than that of the initial γ-Al₂O₃ (139.5 m²/g). This indicates that the support retains high porosity after the deposition of active components. At the same time, an excess of nickel (20:1, 15:5) or iron (5:15, 1:20) leads to phase segregation, the formation of large NiO or Fe₂O₃ agglomerates, a decrease in specific surface area to 95-112 m²/g, and impaired adhesion to the substrate. Thus, the optimal Ni/Fe ratio of 1:1 shows promise for the development of thermally stable catalysts with a well-developed mesoporous structure, suitable for high-temperature hydrogenation and hydrocarbon conversion processes. The results obtained can be used for the further optimization of catalytic systems based on Ni-Fe oxides.
SOL-GEL METHOD, NICKEL-IRON CATALYSTS, COMPOSITION, STRUCTURE, γ-AL2O3
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