High porosity-magnetic composite materials for magnetic induction swing adsorption (MISA): Improvement of performance properties

A magnetic composite consisting of MOF HKUST-1 and magnetite nanoparticles was synthesized and successfully utilized for the separation of CO2 from N2/CO2 mixtures. The CO2 adsorbed by the porous material was successively desorbed by means of a recently proposed, high-efficiency technique so-called Magnetic Induction Swing Adsorption (MISA). The energy necessary to the desorption of carbon dioxide is transferred by electromagnetic induction to the magnetic nanoparticles that promptly dissipate it into heat. The composite material has been synthesized by growing the metal organic framework on functionalized magnetite nanoparticles by means of liquid assisted grinding (LAG) mechanochemical process. The composite material has been characterized in its morphological and functional properties. Thanks to improved magnetic properties, the optimized nanocomposite requires lower magnetic fields to desorb the CO2 and allows for reaching the same regeneration temperature in the sorbent bed at lower magnetic field amplitude, compared to previously synthesized composite materials. A regeneration energy Q of 4.4 MJ/kg CO2 has been calculated at 130 °C desorption temperature.