Methane oxidation behavior over La0.08Sr0.92Fe0.20Ti0.80O3−δ perovskite oxide for SOFC anode

A single phase perovskite-type La0.08Sr0.92Fe0.20Ti0.80O3−δ catalyst was fabricated in air at 800 °C using the Pechini method. The methane conversion rate and hydrogen selectivity over the La0.08Sr0.92Fe0.20Ti0.80O3−δ catalyst were evaluated over the temperature range, 300–900 °C. Complete and partial methane oxidation were predominant at the low and high temperature regions, respectively. The complete oxidation of methane was attributed to a suprafacial mechanism. On the other hand, an intrafacial mechanism might be responsible for the partial oxidation of methane at high temperatures. XPS showed that Fe ions were active sites for methane oxidation reactions over the La0.08Sr0.92Fe0.20Ti0.80O3−δ catalyst. The methane conversion rate and hydrogen selectivity at 900 °C were 52% and 66%, respectively.