Magnetic Framework Composites for Low Concentration Methane Capture

This study proposes a simple and energy efficient technique for methane (CH₄) capture from low concentration emission sources. An extrusion-based process was used to fabricate magnetic framework composites (MFCs) from a metal organic framework (MOF), aluminum fumarate, and MgFe₂O₄ magnetic nanoparticles (MNP). Methane uptake for MFCs with different MNP loading at 1 bar and 300 K revealed a high methane uptake of up to 18.2 cm³ g^-1. To regenerate the MFCs, a magnetic induction swing adsorption (MISA) process was applied. A working capacity of 100% was achieved for the MFC over 10 adsorption-desorption cycles with an average of 6 min per cycle for the regeneration step. The ability to access 100% of the adsorbed CH₄ in the MFC with rapid and localized heating achieved with the MISA process potentially provides an energy efficient technique for CH₄ capture and reuse from low concentration sources.