(225u) Effect of Corrosive Gas Species on Promising Metal Organic Frameworks (MOFs) Material Composites for Direct Air Capture (DAC) of Carbon Dioxide (CO2)

During the past 70 years, concentration of CO₂ in atmosphere has increased above the historical annual average since the beginning of the industrial era from 280 ppm to around 420 ppm in 2023 due to human activities. Due to the increase in the concentration of this species, approaches such as direct air capture (DAC) of CO₂ have been proposed as a containment measure. A series of Metal Organic Frameworks (MOFs) impregnated with chemical compounds as dispersed phase that enhance CO₂ adsorption capacity have shown to be promising for this application. Examples of these materials are MIL-101-Cr and MIL-101-(Cr, Mg) impregnated with polyethyleneimine (PEI), UiO-66-COOH with grafted deep eutectic solvent (DES) composed of choline chloride and urea. However, while the effect of corrosive gas species as SO₂ and NO₂ over the CO₂ adsorption capacity in dry and humid conditions has been studied for some materials such as MIL-101-(Cr, Mg), a detailed study of the effects of these gas species on the dispersed phase cyclic capacity and structural stability at different ambient temperatures is needed to inform future post-synthetic modification of MOFs. My research interests are focused on stability analysis of MOFs and MOF composites with promising performance for CO₂ DAC. Specifically, my goal is to study the effects of SO₂, NO₂, and O₃ on the cyclic and structural stability of material composites with a MOF as a continuous phase, and polyamines and DES as dispersed phase. I will present unpublished results of my research projects and discuss structural aspects that enhance stability and carbon capture in MOF composites to provide guidelines for material design, how to balance stability and adsorption capacity, and which gas species have the greatest impact on these materials. The feasibility of these materials for the application of CO₂ DAC will be addressed considering CO₂ adsorption capacity and long-term stability when exposed to air containing SO₂, NO₂ and O₃ at different concentrations and temperatures.