Systematic in situ Investigation of the Formation of NH3 Cracking Catalysts from Precursor Perovskites ABO3 (A=La,Ca,Sr and B=Fe,Co,Ni) and Their Catalytic Performance.

This work addresses the formation of ammonia (NH3) decomposition catalysts derived from perovskites ABO3 (A = La, Ca, Sr, and B Fe, Co, Ni) precursors via operando synchrotron X‐ray diffraction experiments. During reaction in NH3, perovskite are decomposed transition metals reduced. Depending on their reduction properties, active metallic formed situ La2O3 as support. The behavior perovskites, intermediate phases during activation, catalytic performance was studied detail. In addition, microstructure properties such crystallite sizes particle morphology were analyzed. Co‐/Ni‐based completely activation to Co0/Ni0 supported while Fe‐based fully stable but inactive catalysis. difference is due varying electronic metals, e.g., decreasing electronegativity Ni Fe. With reducibility, more distinct. La3+ partially substituted by Ca2+/Sr2+ LaCoO3 test for advantageous effects NH3 decomposition. best observed using precatalyst La0.8Sr0.2CoO3 with a conversion 86 % (100 15000 mLg‐1h‐1) at 550 °C.