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

Table 2

XPS ratios of O_lattice/O_ads species in the different catalysts made of the oxide mixtures 0.4 La₂O₃–0.2 SrO–(1−𝑥)NiO–xMgO.

Different stoichiometry coefficient 𝑥	XPS ratios of Olattice/Oads species
𝑥=0	0.55
𝑥=0.1	0.36
𝑥=0.2	0.27
𝑥=0.3	0.23
𝑥=0.4	0.18
𝑥=0.5	0.15