Abstract
Abstract Nickel copper manganites, Ni x Cu 1-x Mn 2 O 4 (where 0 ≤ X ≤ 1), powders have been synthesized via co-precipitation method. The formed particles were obtained from the precipitate precursors annealed at 800 °C for 2 h. The prepared powders were tested for the catalytic oxidation of carbon monoxide (CO) into carbon dioxide (CO 2 ). The results indicated that the intermediate compositions displayed better catalytic activity than the end compositions for CO oxidation due to the phenomena of synergism. The composition of x = 0.3 and 0.5 showed rapid rise in CO conversion with temperature; about 40% conversion was achieved at 200 °C for the produced manganite sample of chemical composition Cu 0 . 7 Ni 0 . 3 Mn 2 O 4 . A correlation between magnetic properties and hydrogen reduction of manganites was demonstrated. Magnetic properties of reduced manganite were found to be duplicated. The saturation magnetization of reduced NiMn 2 O 4 into Ni/MnO was duplicated of order 15 times from initial value.
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