Ln/Fe-doped Sr2TiO4 layered perovskites: Effect of synthesis method and composition on physical-chemical and catalytic properties in oxidative coupling of methane

Authors

Svetlana Pavlova¹ , Aleksandr Gorkusha¹ , Sergey Tsybulya¹ , Anna Nartova¹ , Vladimir Rogov¹ , Lubov Isupova¹

1. Boreskov Institute of Catalysis

Conference / event

8th Asian Symposium on Advanced Materials ASAM-8, July 2023 (Novosibirsk, Russian Federation)

Poster summary

Layered Ruddlesden-Popper perovskite Sr2TiO4 is considered as the active catalyst for oxidative coupling of methane (OCM). Substitution of perovskite Sr or/and Ti positions with cations of different nature and charge enables tailoring concentration and type of surface defects, active oxygen species and basic sites defining perovskite OCM activity that is also strongly influenced by a preparation method. In this work, the impact of the nature of cations partially replacing Sr (La, Nd, Pr) or Ti (Fe) and the method of their introduction in Sr2TiO4 on the morphological, structural, redox properties and OCM catalytic activity was studied. The results show that doping with La(Nd) increases perovskite OCM activity while Pr(Fe) decrease it. The high activity of La(Nd)-doped samples is conditioned by the presence of surface lattice oxygen reduced at medium temperatures. For Pr and Fe-doped catalyst, a large amount of chemisorbed oxygen facilitates COx formation and decreases C2 selectivity.

Keywords

Layered Ruddlesden-Popper perovskite, Methane oxidative coupling, Impregnation, Sol-gel, Doping

Research areas

Chemistry, Chemical Engineering

References

1. W.M. Yang, Q.J. Yan, X.C. Fu, React. Kinet. Catal. Lett. 54 (1995) 21–27.
2. Y. Sim, D. Kwon, S. An, J.-M. Ha, T.-S. Oh, J.C. Jung, Mol. Catal., 489(2020)110925
3. Y.A. Ivanova, E.F. Sutormina, N.A. Rudina, A.V. Nartova, L.A. Isupova, Catalysis Com., 117 (2018) 43–48.

Funding

1. the budjet project for Boreskov Institute of Catalysis (No. АААА-А21-121011490008-3)

Supplemental files

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Additional information

Competing interests

No competing interests were disclosed.

Data availability statement

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

Creative Commons license

Copyright © 2023 Pavlova et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.