A Decrease in NiO-MgO Phase Through Its Solid Solution Equilibrium with Tetragonal (La_𝟏−𝑧Sr_𝑧)_𝟐Ni_𝟏−𝑦Mg_𝑦O_𝟒−𝛿: Effect on Catalytic Partial Oxidation of Methane

Figure 9

XRD patterns of the three used catalysts after POM for 50 h at 850°C (with reference to Figure 7): ^Tthe tetragonal phase, ^•La-Sr-O, ^∆SrCO₃, ^♦NiO/MgO solution, ^◊Ni⁰, and ^Ccarbon.