Abstract
Ni-containing SrFeO3-δ/Al2O3 and Ce0.5Zr0.5O2-δ/Al2O3 catalysts were prepared and deposited onto surfaces of porous alumina oxide foams. The measured oxygen storage capacity values are 1448 and 1275 µmol-O/g for SrFeO3-δ and Ce0.5Zr0.5O2-δ powder, respectively (about 55% and 75% of their theoretical values). The experimental reactor using exhaust gas of a gasoline engine was assembled. Decrease of CO and other harmful components in case of Ni/SrFeO3-δ/Al2O3 coating is comparable to that of Ni/Ce0.5Zr0.5O2-δ/Al2O3 layer. After reactor conditions (700 °C during 15–20 min), microstructure of both catalysts remains unchanged. Strontium ferrite maintained an orthorhombic brownmillerite-type crystal structure, whereas nickel was detected in both metallic and oxide forms.
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