Large-scale preparation of powder composites xNiO/(1-x)Al2O3 in reactions of solution combustion synthesis |
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Authors: | VD Zhuravlev LV Ermakova |
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Affiliation: | Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, 91, Pervomaiskaya Str., 620990 Ekaterinburg, Russia |
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Abstract: | The conditions for the production of composites by Solution Combustion Synthesis (SCS) from reaction solutions of aluminum and nickel nitrates of various concentrations with glycine have been studied. The concentration of reaction solutions increases the product yield and the productivity of SCS process. The effect of the presence of Al3+ cations in reaction solutions on the combustion reaction intensity reduction has been established. The SCS precursors contained metallic nickel, nickel oxide and amorphous alumina. The phase composition of the samples changed in the process of annealing: nickel oxidation, crystallization of γ-Al2O3 (600 °C) and formation of NiAl2O4 spinel (600–800 °C) were observed. The maximal specific surface area value recorded after annealing at 800 °C was 59–63 m2/g. In samples obtained with a lower fuel content, γ-Al2O3 or a mixture of γ-Al2O3 and NiAl2O4 crystallize on the surface of composite particles. The concentration of NiO on the surface of composites obtained from precursors synthesized from concentrated solutions at φ = 1.4 is close to the nominal composition. |
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Keywords: | Solution combustion synthesis X-ray diffraction EDX |
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