Low Temperature Formation of Ruddlesden–Popper‐Type Layered La₂CoO_4±δ Perovskite Monitored via In Situ X‐ray Powder Diffraction

Abstract

In this contribution low temperature formation of Ruddlesden-Popper (RP)-type layered La 2 CoO 4±δ perovskite was optimized via in situ X-ray powder diffraction (XRPD). Starting from LaCoO 3 a stoichiometric transformation to La 2 CoO 4±δ and CoO can be achieved by controlled reduction with H 2 . The challenge of this reaction is the use of appropriate amounts of H 2 in a defined temperature region. If the amount of H 2 is too high, complete reduction of the perovskite occurs. If temperatures are not appropriate, intermediate phases seem to hinder [a]

Mechanistic in situ insights into the formation, structural and catalytic aspects of the La2NiO4 intermediate phase in the dry reforming of methane over Ni-based perovskite catalysts

“…In the case of LaCoO3 (trigonal structure), pre-reduction triggered the phase transformation to orthorhombic La2CoO4, as evidenced by in situ X-ray diffraction [51]. As with studies on LaNiO3, analysis is mainly based on ex situ analysis of the initial and spent…”