Power‐to‐X Processes with Synthetic Iron Oxides

Iron oxide redox cycling presents a pathway to integrate electrolytic hydrogen production and storage. Furthermore, utilizing CO 2 with iron‐based materials, enables synthesis gas production without noble metal catalysts, exhibiting high thermochemical stability. Experimental data reveals that a hydrogen flow of 0.07 m 3 h −1 achieves ≈45% reduction. Doubling the H 2 flow enhances reduction by over 20%. Complete reduction necessitates 4.25 times the stoichiometric H 2 ; complete oxidation requires 4.29 times stoichiometric CO 2 , with 0.015 m 3 h −1 CO 2 at 900 °C showing higher efficiency. While H 2 reduction is near‐complete across tested binders, CO 2 reoxidation is limited. Notably, a 20% aluminous binder facilitates full oxygen exchange over 20 redox cycles, albeit with gradual kinetic deceleration. The versatility of CO 2 sources allows for the production of sustainable chemicals and fuels, facilitating climate‐neutral processes when coupled with green hydrogen. These findings underscore the potential of iron oxide redox chemistry in advancing sustainable energy and chemical synthesis.