Nd2−xSrxNiO4 Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane

Solid solutions Nd2−xSrxNiO4±δ (x = 0, 0.5, 1, 1.2, 1.4) with a K2NiF4 structure can be obtained from freeze-dried precursors. The end members of this series at T ≥ 1000 °C only, while complex oxides x 1; 1.5 are formed 700 °C. Thermal analysis revealed the two stages thermal reduction in 10%H2/Ar gas mixture that was completed 900 For < 0.2, products demonstrated an exsolution-like morphology Ni nanoparticles allocated surface oxide grains. As-obtained nanocomposites 0 and > 1 outstanding catalytic activity selectivity dry reforming methane (DRM) reaction 800 CH4 conversion close to thermodynamic values. appearance different maxima properties Ni/(Nd2O3,SrCO3) could affiliated domination positive contributions Nd2O3 SrCO3, respectively.