We investigated steam reforming of toluene as a model compound of aromatic hydrocarbons included in biomass tar over Co supported La0.7Sr0.3AlO3-δ (LSAO), perovskite oxide. Ni-supported LSAO catalyst has shown high activity and coke resistance from the redox property of lattice oxygen in/on the LSAO support. Co is known as an active metal for this reaction, so Co/LSAO catalyst was investigated in this work. Co/LSAO catalyst, which showed high steady-state activity and stability, was characterized using H2 18O isotopic transient response tests, STEM, FT-IR, Arrhenius plot and partial pressure dependence to elucidate high and stable catalytic activity. In situ FT-IR measurements revealed that reaction intermediates on Co/LSAO desorbed at 873K or lower temperatures. Although redox property of lattice oxygen did not change at around 848K based on isotopic transient tests, the Arrhenius plots indicate that the rate-determining step changed at around 848K because of reaction intermediate decomposition desorption. Fast reaction and desorption of absorbed intermediates on Co/LSAO enable catalytic stability during toluene steam reforming.
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