Insights into the Reactivity of La1−xSrxMnO3 (x = 0 ÷ 0.7) in High Temperature N2O Decomposition

• Published in: Catalysis letters 2011-02, Vol.141 (2), p.322-331
• Main Authors: Ivanov, D. V., Pinaeva, L. G., Isupova, L. A., Nadeev, A. N., Prosvirin, I. P., Dovlitova, L. S.
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Organometallic Chemistry; Physical Chemistry
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-010-0503-0

In this paper a wide range of La 1− x Sr x MnO 3 ( x  = 0–0.7) perovskites was synthesized by Pechini route, characterized by XRD (including high temperature measurements), XPS, differential dissolution phase analysis, TPR H 2 , oxygen exchange and tested in N 2 O decomposition at 900 °C. At low degree of Sr substitution for La ( x  ≤ 0.3), high catalytic activity was found for perovskites with hexagonal structure ( x  = 0.1–0.2) and can be related to fast oxygen mobility caused by the lattice disordering during polymorphic phase transition from the hexagonal to cubic structure. For multiphase samples ( x  > 0.3) increase of activity and oxygen mobility can be attributed to the formation of the layer-structured perovskite–LaSrMnO 4 on the surface. Graphical Abstract Catalytic activity of La–Sr–Mn–O samples in high-temperature N 2 O decomposition is discussed with emphasis on its relation to oxygen mobility, surface composition and microstructure of the catalyst particles.