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 3

Coke deposited on the catalysts generated from the oxide mixtures: 0.4 La₂O₃–0.2 SrO–(1−x)NiO–xMgO after POM at 850°C over 50 h.

Different stoichiometry coefficient 𝑥	Coke on catalyst (wt%)
𝑥=0	20.7
𝑥=0.1	4.5
𝑥=0.2	1.6
𝑥=0.3	1.3
𝑥=0.4	0.8
𝑥=0.5	0.3