In Situ Electromagnetic Induction Heating for CO₂Temperature Swing Adsorption on Magnetic Fe₃O₄/N-Doped Porous Carbon

Temperature swing adsorption (TSA) has great potential for CO2 capture. However, the limited energy efficiency and time-consuming procedure have impeded its applications. Herein, we provide a promising solution by in situ electromagnetic induction heating for TSA-based CO2 capture (EMIH-CO2-TSA). The magnetic adsorbents are fabricated by growing magnetic Fe3O4 nanoparticles in N-doped porous carbon (NPC). With a large surface area, N doping, and highly dispersed Fe3O4 nanoparticles (less than 50 nm), the obtained Fe3O4/NPC-15 exhibits a high CO2 adsorption capacity of 2.64 mmol g-1 at 1 bar, a saturation magnetization of 15.51 emu g-1, and an average heat capacity of 1.71 J g-1 K-1. Using the optimized fixed target temperature heating mode on the self-established EMIH device, Fe3O4/NPC-15 exhibits an excellent EMIH-CO2-TSA performance, where the CO2 desorption rate and the energy efficiency are as high as 3.27 mg g-1 s-1 and 79.2%, respectively, at 110 °C and 1 bar, surpassing the trade-off between them. Being the accurate controllable target-heating characteristics, the energy efficiency of EMIH-CO2-TSA is much better than that of the conventional convective-heat-transfer TSA, which provides a promising alternative technology for CO2 capture.