Electromagnetic confinement in Pt/Ni foam: Accelerating oxygen circulation to enhance low-temperature toluene...

The consumption and regeneration of reactive oxygen species (ROS) play a crucial role in toluene oxidation process. Traditional approaches primarily focus on accelerating gaseous oxygen activation through material optimization. However, these methods are constrained by sluggish kinetic processes and oxygen migration rates. Given the limitations of conventional methods, this study develops a novel strategy for efficient modulations of ROS circulation by preparing a magnetic Pt/Ni Foam (Pt/NF) catalyst through impregnation and coupling it with electromagnetic induction heating (EMIH) technology. It demonstrates exceptional toluene oxidation performance. At 147 °C, the Pt/NF-EMIH system can completely oxide toluene, whereas Pt/NF driven by conventional resistance heating showed no significant activity. Mechanically, the "electromagnetic cage" effect formed by NF confines electromagnetic energy, enhancing the ROS circulation through thermal effects and precise modulation of electronic distribution of Pt/NF. The thermal effect induced by EMIH alters the structure of oxygen species on the catalyst, accelerating oxygen vacancy regeneration and promoting lattice oxygen mobility. The alternating magnetic field induces electronic redistribution, thereby enhancing the electron-donating ability of Pt for the dissociation and activation of O₂. Driven by EMIH, the dynamic process of Pt/NF-involved ROS circulation is intensified through more efficient electron synergy. Ultimately, toluene oxidation is accelerated, enabling efficient low-temperature degradation.