In Situ Electromagnetic Induction Heating for CO<sub>2</sub> Temperature Swing Adsorption on Magnetic Fe<sub>3</sub>O<sub>4</sub>/N-Doped Porous Carbon
Xiaoqing Lin, Bin Shao, Jichu Zhu, Fenghongkang Pan, Jun Hu, Meihong Wang, Honglai Liu
Abstract
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.