(99f) Comparative Studies of the Catalytic Behaviors By Ferrite-Based Single-Atom Catalysts for CO Oxidation in Thermal and Magnetic Induction Heating Reactors

CO oxidation is one of the most extensively investigated reactions in the field of environmental catalysis because of its fundamental importance and industrial relevance. This reaction is conventionally taking place in thermal reactors, where the required thermal energy input to initiate the reaction is supplied through the heat transfer from tube furnaces. As expected, the temperature ramping rate in a lab reactor setting usually lags the true application scenario in automotive catalysis, and the energy loss could be high due to layers of heat transfer to many spectator parts other than the targeted catalyst bed. To enable less energy consumption and faster catalyst heating, magnetic induction heating offers the ability to directly apply energy at the catalyst particle and is a promising alternative approach when proper catalytic materials are adopted. In this work, a high frequency (i.e., ~200 kHz) alternating magnetic field is applied to a ferromagnetic material that can generate heat by hysteresis losses. This self-heating mechanism is fast and contactless, thereby overcoming heat transfer limitations and reduces the energy consumption. From the catalysis perspective, our research employs FeO_x as a catalyst support to carry the atomically dispersed platinum group metals to catalyze the CO oxidation. Our results suggest that, under magnetic induction heating, Pt₁/FeO_x catalyst delivers excellent catalytic activity for CO oxidation near ambient temperatures with an almost instant heating from 50 to 200 ^oC (50mg Pt₁/FeO_x, 0.5% CO, 0.5% O₂, Ar balance, gas flowrate = 100 mL/min, WHSV = 120000 mLg^-1hr^-1, GHSV = 16834 hr^-1_, 13-20 mT). Despite the encouraging reactivity, it remains unknown to the community whether the regulated cyclic electron movement and alignment in the catalyst under the magnetic field will result in different catalytic chemistry from its conventional thermal reaction counterpart. We will report our findings for such a comparative study in this presentation