Catalytic Activity of LaFe0.4Ni0.6O3/CeO2 Composites in CO and CH4 Oxidation Depending on Their Preparation Conditions

Lyubov Isupova; Evgeny Gerasimov; Igor Prosvirin; Vladimir Rogov

doi:10.3390/ma16031142

Catalytic Activity of LaFe_0.4Ni_0.6O₃/CeO₂ Composites in CO and CH₄ Oxidation Depending on Their Preparation Conditions

Materials (Basel). 2023 Jan 29;16(3):1142. doi: 10.3390/ma16031142.

Authors

Lyubov Isupova¹, Evgeny Gerasimov¹, Igor Prosvirin¹, Vladimir Rogov¹

Affiliation

¹ Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia.

Abstract

LaFe_0.4Ni_0.6O₃/CeO₂ (1:1) two-phase composite materials were prepared by mechanochemical (MC) and Pechini routes. The catalytic properties of the composites in methane and CO oxidation reactions strongly depend on their preparation conditions. In low-temperature (<600 °C) catalytic CO oxidation the composites demonstrate a higher activity compared with LaFe_0.4Ni_0.6O₃ perovskite. The highest activity was observed for the composite prepared by mechanical treatment of perovskite and fluorite precursors. There is a correlation between activity and the content of weakly bound surface oxygen species. Catalytic activity in high-temperature (>750 °C) catalytic methane oxidation correlates with the reducibility of samples. The highest activity was observed for the composite prepared by the one-pot Pechini route with higher reducibility of the sample up to 600 °C.

Keywords: CO oxidation; LaFe0.4Ni0.6O3/CeO2 composites; methane; preparation.

Grants and funding

project АААА-А21-121011490008-3./This work was supported by Ministry of Science and High Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis