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Abstract
We use the process of exsolution of ruthenium from a 3 at% ruthenium substituted LaFeO3 (LFR3) perovskite oxide to produce a high performing ruthenium supported catalyst. To increase the atomic efficiency of the catalyst, the exsolution process is designed to produce a high density of small Ru particles and thus a high atomic efficiency of ruthenium. A high-temperature redox pretreatment at 800 °C enriches the Ru concentration in the near-surface region of LFR3, while a subsequent mild reduction step with H2 at 500 °C leads to the Ru exsolution from the Ru-enriched near-surface region (LFR3_Redox_500R), resulting in a high density of small particles that are not passivated by LaOx. This catalyst is tested on two prototypical catalytic reactions, namely the oxidation in propane combustion and the reduction in CO2 hydrogenation. For both reactions, the activity of the redox-pretreated sample LFR3_Redox_500R is significantly higher than that of the untreated sample (LFR3_500R). For the catalytic hydrogenation of CO2, the high selectivity is switched from methane for LFR3_Redox_500R to CO for LFR3_500R.
