Novel perovskite catalysts for CO2 utilization - Exsolution enhanced reverse water-gas shift activity

Reverse Water-Gas Shift (rWGS) is among the reactions with highest readiness level for technological implementation of CO2 utilization as an abundant and renewable carbon source, its transformation instance into synthetic fuels. Hence, great efforts are made in terms further development comprehension novel catalyst materials. To achieve excellent catalytic performance, catalytically active (nano)particles that evenly distributed on (and ideally embedded in) support crucial. An extremely versatile material class exhibits desired properties perovskite-type oxides due to fact they can easily be doped highly elements. Upon controlled reduction or during reaction, these dopants leave perovskite lattice diffuse through form nanoparticles at surface (by exsolution) where greatly enhance activity. Here, six perovskites were studied their exsolution capabilities well rWGS performance explored. Nanoparticle significantly enhanced activity, activity being order Nd0.6Ca0.4Fe0.9Co0.1O3-δ > Nd0.6Ca0.4Fe0.9Ni0.1O3-δ Nd0.9Ca0.1FeO3-δ Nd0.6Ca0.4FeO3-δ La0.6Ca0.4FeO3-δ La0.9Ca0.1FeO3-δ La0.6Sr0.4FeO3-δ(benchmark). Moreover, it could shown formed stable high reaction temperatures. In this paper, flexibility investigated materials demonstrated, one hand facilitating a design approach enabling control over size composition exsolved nanoparticles. On other hand, offer tuneable host providing oxygen vacancies efficient adsorption, activation, resulting interface boundaries ability