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 1

X-ray diffraction (XRD) patterns of the catalyst precursors made of 0.4 La₂O₃–0.2 SrO–(1−x)NiO–𝑥MgO (^Ttetragonal (La_1−zSr_z)₂Ni_1−yMg_yO_4−δ, ^Oorthorhombic (La_1−zSr_z)₂NiO_4−δ, *La₂O₃, ^∆SrCO₃, ^♦NiO/MgO solution, ^▲NiO): (a) 𝑥=0, (b) 𝑥=0.1, (c) 𝑥=0.2, (d) 𝑥=0.3, (e) 𝑥=0.4, (f) 𝑥=0.5.