Formation of the metal-oxide nanocomposites during the partial reduction of Nd-Sr nickelatesстатья
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Аннотация:A thermal reduction of Nd2−xSrxNiO4−δ (x = 0–1.4) solid solutions in an Ar/H2 gas mixture occursin several separate stages. The initial stages of reduction presumably related to the reduction of Ni3+ to Ni2+ cause only minor changes in the initial K2NiF4 type structure and retain the morphology of the complex oxide particles. Occasionally, this process is accompanied by the appearance of Ni metal nanoparticles at the surface of oxide grains. As-obtained Ni/metal oxide nanocomposites similar to the products of redox exsolution demonstrate noticeable catalytic activity in the reaction of CO2 hydrogenation at T = 350–400◦C.