Exsolution-like synthesis of Ni/(Nd2O3,CaO) nanocomposites from Nd2-xCaxNiO4 precursors for catalytic applications

A series of K2NiF4-like complex oxides Nd2-xCaxNiO4 (x = 0-0.4) was obtained by the freeze drying synthesis method. Thermal decomposition of these precursors in H-2 at 900 degrees C resulted in the formation of Ni/(Nd2O3,CaO) composites with different Nd2O3/CaO ratios. Their microstructure was similar to the products of the redox exsolution of perovskites: spherical 30 nm particles of Ni metal were allocated at the surface of dense agglomerates of Nd2O3 and CaO grains. The as-obtained composites demonstrated significant catalytic activity, selectivity, and stability in the reactions of dry reforming and partial oxidation of methane (DRM and POM, respectively) at T >= 800 degrees C.

Automated summary

A series of K2NiF4-like complex oxides Nd2-xCaxNiO4 (x = 0-0.4) were synthesized by freeze drying. The resulting composites demonstrated significant catalytic activity, selectivity, and stability in dry reforming and partial oxidation reactions of methane.