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Manganese iron or nickel mixed oxide catalysts (MnFe or MnNi, respectively) were obtained by coprecipitation varying the aging time. A detailed description of the bulk and surface structure of each system was achieved by means of measurements of specific surface area, XRD, XPS, FT-IR, and Mössbauer spectroscopies. The characterisation results show that MnNi catalysts are formed by NiMnO 3 ...
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