In Situ Growth of Exsolved Nanoparticles under Varying rWGS Reaction Conditions&mdash;A Catalysis and Near Ambient Pressure-XPS Study

Perovskite-type oxides are highly flexible materials that show properties that are beneficial for application in reverse water-gas shift processes (rWGS). Due to their stable nature, the ability to incorporate catalytically active dopants in their lattice structure, and the corresponding feature of nanoparticle exsolution, they are promising candidates for a materials design approach. On an industrial level, the rWGS has proven to be an excellent choice for the efficient utilisation of CO₂ as an abundant and renewable carbon source, reflected by the current research on novel and improved catalyst materials. In the current study, a correlation between rWGS reaction environments (CO₂ to H₂ ratios and temperature), surface morphology, and catalytic activity of three perovskite catalysts (Nd_0.6Ca_0.4Fe_0.9Co_0.1O_3-δ, Nd_0.6Ca_0.4Fe_0.97Co_0.03O_3-δ, and Nd_0.6Ca_0.4Fe_0.97Ni_0.03O_3-δ) is investigated, combining catalytic measurements with SEM and NAP-XPS. The materials were found to react dynamically to the conditions showing both activation due to in situ nanoparticle exsolution and deactivation via CaCO₃ formation. This phenomenon could be influenced by choice of material and conditions: less reductive conditions (larger CO₂ to H₂ or lower temperature) lead to smaller exsolved particles and reduced carbonate formation. However, the B-site doping was also important; only with 10% Co-doping, a predominant activation could be achieved. View Full-Text

Keywords: reverse water-gas shift; perovskites; exsolution; nanoparticles; doping

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Lindenthal, L.; Huber, J.; Drexler, H.; Ruh, T.; Rameshan, R.; Schrenk, F.; Löffler, S.; Rameshan, C. In Situ Growth of Exsolved Nanoparticles under Varying rWGS Reaction Conditions—A Catalysis and Near Ambient Pressure-XPS Study. Catalysts 2021, 11, 1484. https://doi.org/10.3390/catal11121484

AMA Style

Lindenthal L, Huber J, Drexler H, Ruh T, Rameshan R, Schrenk F, Löffler S, Rameshan C. In Situ Growth of Exsolved Nanoparticles under Varying rWGS Reaction Conditions—A Catalysis and Near Ambient Pressure-XPS Study. Catalysts. 2021; 11(12):1484. https://doi.org/10.3390/catal11121484

Chicago/Turabian Style

Lindenthal, Lorenz, Joel Huber, Hedda Drexler, Thomas Ruh, Raffael Rameshan, Florian Schrenk, Stefan Löffler, and Christoph Rameshan. 2021. "In Situ Growth of Exsolved Nanoparticles under Varying rWGS Reaction Conditions—A Catalysis and Near Ambient Pressure-XPS Study" Catalysts 11, no. 12: 1484. https://doi.org/10.3390/catal11121484

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In Situ Growth of Exsolved Nanoparticles under Varying rWGS Reaction Conditions—A Catalysis and Near Ambient Pressure-XPS Study

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