TY - JOUR

T1 - How reduction temperature influences the structure of perovskite-oxide catalysts during the dry reforming of methane

AU - Schrenk, Florian

AU - Lindenthal, Lorenz

AU - Drexler, Hedda

AU - Berger, Tobias

AU - Rameshan, Raffael

AU - Ruh, Thomas

AU - Föttinger, Karin

AU - Rameshan, Christoph

N1 - Publisher Copyright: © 2024 RSC.

PY - 2024/10/10

Y1 - 2024/10/10

N2 - Dry reforming of methane is a promising reaction to convert CO2 and combat climate change. However, the reaction is still not feasible in large-scale industrial applications. The thermodynamic need for high temperatures and the potential of carbon deposition leads to high requirements for potential catalyst materials. As shown in previous publications, the Ni-doped perovskite-oxide Nd0.6Ca0.4Fe0.97Ni0.03O3 is a potential candidate as it can exsolve highly active Ni nanoparticles on its surface. This study focused on controlling the particle size by varying the reduction temperature. We found the optimal temperature that allows the Ni nanoparticles to exsolve while not yet enabling the formation of deactivating CaCO3. Furthermore, the exsolution process and the behaviour of the phases during the dry reforming of methane were investigated using in situ XRD measurements at the DESY beamline P02.1 at PETRA III in Hamburg. They revealed that the formed deactivated phases would, at high temperatures, form a brownmillerite phase, thus hinting at a potential self-healing mechanism of these materials.

AB - Dry reforming of methane is a promising reaction to convert CO2 and combat climate change. However, the reaction is still not feasible in large-scale industrial applications. The thermodynamic need for high temperatures and the potential of carbon deposition leads to high requirements for potential catalyst materials. As shown in previous publications, the Ni-doped perovskite-oxide Nd0.6Ca0.4Fe0.97Ni0.03O3 is a potential candidate as it can exsolve highly active Ni nanoparticles on its surface. This study focused on controlling the particle size by varying the reduction temperature. We found the optimal temperature that allows the Ni nanoparticles to exsolve while not yet enabling the formation of deactivating CaCO3. Furthermore, the exsolution process and the behaviour of the phases during the dry reforming of methane were investigated using in situ XRD measurements at the DESY beamline P02.1 at PETRA III in Hamburg. They revealed that the formed deactivated phases would, at high temperatures, form a brownmillerite phase, thus hinting at a potential self-healing mechanism of these materials.

UR - http://www.scopus.com/inward/record.url?scp=85206656677&partnerID=8YFLogxK

U2 - 10.1039/d4su00483c

DO - 10.1039/d4su00483c

M3 - Article

AN - SCOPUS:85206656677

VL - 2024

SP - 3334

EP - 3344

JO - RSC sustainability

JF - RSC sustainability

SN - 2753-8125

IS - 11

ER -