Abstract
The activity of NiCu-SiO2 catalysts with a metal content of 90% and different Ni/Cu ratios has been investigated in the hydrodeoxygenation of anisole, a model compound of bio-oil, at 280°C and 6 MPa. A homogeneous phase composition of the active component has been synthesized by the co-decomposition of nickel and copper nitrates followed by the introduction of SiO2 as a stabilizer. The resulting catalysts have been characterized by temperature-programmed reduction, X-ray powder diffraction, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy combined with energy-dispersive microanalysis. The bulk and surface composition of active-component particles has been determined by XPS and X-ray diffraction. In all of the catalysts containing 15–85 wt % Ni, there are two types of solid solutions. One has a constant composition, Cu0.95Ni0.05, which is independent of the Ni/Cu ratio in the catalyst; in the other, the nickel stoichiometry increases with an increasing Ni content of the active component. A correlation has been established between the Ni/Cu ratio and the rate constants of the reaction examined and between the Ni/Cu ratio and the degree of hydrodeoxygenation for all samples. The most active catalyst is Ni85Cu5-SiO2.
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Original Russian Text © A.A. Smirnov, S.A. Khromova, O.A. Bulavchenko, V.V. Kaichev, A.A. Saraev, S.I. Reshetnikov, M.V. Bykova, L.I. Trusov, V.A. Yakovlev, 2014, published in Kinetika i Kataliz, 2014, Vol. 55, No. 1, pp. 72–81.
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Smirnov, A.A., Khromova, S.A., Bulavchenko, O.A. et al. Effect of the Ni/Cu ratio on the composition and catalytic properties of nickel-copper alloy in anisole hydrodeoxygenation. Kinet Catal 55, 69–78 (2014). https://doi.org/10.1134/S0023158414010145
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DOI: https://doi.org/10.1134/S0023158414010145