Enhanced conversion of a magnetic oxide to metal using induction heating: Application for H2 production

In this study, a C-CoFe2O4 composite is proposed for reduction in an induction heating reactor with a continuous argon flow. An impressive conversion efficiency of 87% is achieved at a maximum temperature of 325 degrees C in just 8 min without the need for vacuum. The impact of the molar ratio of metal oxide to reducing agent (acetylacetone) is also examined. Results indicate that a 1:1 ratio favours the reduction towards cobalt and iron monoxides, while a 1:3 ratio yields a 31% metal phase. The highest conversion (87%) is seen with a 1:17 ratio, indicating the need for excess reducing agent for effective conversion of CoFe2O4 oxide. The molar ratio influences the induction heating temperature, with the 1:17 ratio having a lower temperature of 325 degrees C compared to 450 degrees C for other ratios. These operating temperatures (<= 450 degrees C) are significantly lower than those reported in the literature for carbothermal reduction in an induction reactor (>1700 degrees C), which often requires vacuum and very high temperatures for high conversion efficiency. The proposed process offers advantages such as high conversion efficiency, fast processing, and simpler operational conditions. Additionally, the metallic phases produced are utilized for H-2 production in thermochemical water splitting, showcasing these materials potential for energy generation applications.