Ferrites for the Magnetically Induced CO2 Reduction.

Abstract

CO2 mitigation is one of the most urgent issues humanity needs to address, and magnetically induced catalysis could be a powerful tool to contribute to this goal. Developing dual-functional materials (DFMs) that can act both as catalysts and as heating agents under an external magnetic field is challenging. Yet, it could unlock the full potential of induction heating for CO2 valorization. In this work, we present a series of CoFe2O4 and NiFe2O4-based DFMs capable of catalyzing the reduction of this greenhouse gas in the range 220-300 °C, under low alternating magnetic fields (19.6-39.2 mT, 100 kHz frequency). The reduction pretreatment is closely linked to their heating ability, since alloy formation plays a fundamental role in magnetically induced energy dissipation as heat. CoFe2O4 prepared via a sol-gel autocombustion route exhibits the highest catalytic activity ( X CO 2 ≈ 60%, SCO = 95% at 300 °C), along with the best heating ability, where the formation of localized hot spots under magnetic induction may contribute to the observed performance. Accordingly, it emerges as a reference candidate for magnetically induced CO2 reduction.

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