(120g) Microwave Assisted Regeneration of Nohm-I-PEI

Over the past three decades, one of humanity's most significant issues has been greenhouse gas emissions, which are regrettably still rising. A new technique called Direct Air Capture (DAC) has recently drawn much attention regarding removing carbon dioxide from the atmosphere. The regeneration process of DAC technology, however, necessitates a substantial amount of thermal energy . While there are several ways to extract CO2 from flue gases, the temperature swing adsorption process (TVSA), one of the most popular approaches, has been chosen for the proposed study because it not only requires a lower temperature than the other approaches, but it also has the benefit of being low-component and straightforward. The regeneration of CO2 is the primary cause of the DAC system's relatively high desorption cost, which is caused by thermal losses and the lengthy process heating of traditional active heating [1-2].

Polyethylenimine-functionalized liquid-like nanoparticle organic hybrid materials (NOHM-I-PEI) are capable of efficiently capturing CO2 from a variety of CO2 concentrations, including direct air capture. Its adsorption capacities are as high as 1.7 mmol CO2/g of NPEI − SIPs for direct air capture applications [3-4].

In contrast to traditional heating methods, microwave swing regeneration has the advantages of fast heating and cooling, non-contact heating, volumetric heating, and selective material heating [5-7].

This study examines the impact of varying the initial microwave input power and incorporating nanoparticles on the desorption rate and energy requirements for the regeneration process. The solid sorbent used in this study is Liquid-like Nanoparticle Organic Hybrid Materials (NOHM-I-PEI) and the nanoparticle used is Silicon Carbide (SiC). The results proved that incorporating nanoparticles not only increased the absorbed power but also accelerated the CO₂ release. Furthermore, increasing the initial microwave input power will increase electromagnetic energy, potentially leading to a higher heating rate and higher CO2 outlet concentrations peak.