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

Abstract

LaFe0.4Ni0.6O3/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 (0.4Ni0.6O3 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

• LaFe_0.4Ni_0.6O₃/CeO₂ composites
• preparation
• methane
• CO oxidation