In Situ Electromagnetic Induction Heating for CO_2 Temperature Swing Adsorption on Magnetic Fe_3O_4/N-Doped Porous Carbon

摘要

Temperature swing adsorption (TSA) has great potential for CO_(2) 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 CO_(2) capture (EMIH-CO_(2)-TSA). The magnetic adsorbents are fabricated by growing magnetic Fe_(3)O_(4) nanoparticles in N-doped porous carbon (NPC). With a large surface area, N doping, and highly dispersed Fe_(3)O_(4) nanoparticles (less than 50 nm), the obtained Fe_(3)O_(4)/NPC-15 exhibits a high CO_(2) 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, Fe_(3)O_(4)/NPC-15 exhibits an excellent EMIH-CO_(2)-TSA performance, where the CO_(2) 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-CO_(2)-TSA is much better than that of the conventional convective-heat-transfer TSA, which provides a promising alternative technology for CO_(2) capture.