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 4

TEM images of the H₂-reduced catalyst precursors made of 0.4 La₂O₃–0.2 SrO–(1−x) NiO–xMgO: (a) 𝑥=0, (b) 𝑥=0.1, (c) 𝑥=0.5, in which the dark micro-domains are embedded Ni⁰ clusters.

(a)

(b)

(c)