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

作者

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

1. Boreskov Institute of Catalysis

会议/活动

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

海报摘要

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.

关键词

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

研究领域

Chemistry, Chemical Engineering

参考文献

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.

基金

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

补充材料

1. Abstract   Download

附加信息

利益冲突

No competing interests were disclosed.

数据可用性声明

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

知识共享许可协议

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.