CeFeO 3 -CeO 2 -Fe 2 O 3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO 2 Hydrogenation.

Rare-earth orthoferrites have found wide application in thermocatalytic reduction-oxidation processes. Much less attention has been paid, however, to the production of CeFeO 3 , as well as to the study of its physicochemical and catalytic properties, in particular, in the promising process of CO 2 utilization by hydrogenation to CO and hydrocarbons. This study presents the results of a study on the synthesis of CeFeO 3 by solution combustion synthesis (SCS) using various fuels, fuel-to-oxidizer ratios, and additives. The SCS products were characterized by XRD, FTIR, N 2 -physisorption, SEM, DTA-TGA, and H 2 -TPR. It has been established that glycine provides the best yield of CeFeO 3 , while the addition of NH 4 NO 3 promotes an increase in the amount of CeFeO 3 by 7-12 wt%. In addition, the synthesis of CeFeO 3 with the participation of NH 4 NO 3 makes it possible to surpass the activity of the CeO 2 -Fe 2 O 3 system at low temperatures (300-400 °C), as well as to increase selectivity to hydrocarbons. The observed effects are due to the increased gas evolution and ejection of reactive FeO x nanoparticles on the surface of crystallites, and an increase in the surface defects. CeFeO 3 obtained in this study allows for achieving higher CO 2 conversion compared to LaFeO 3 at 600 °C.