478211 Mg/DOBDC MOF Functionalized with Ethylene Diamine for Improved Resistance to Humidity in CO2 Capture Applications
To minimize the effects of humidity to the structure and CO2 capture performance of MOFs, this work investigates the addition of amine functional groups to improve the stability of the MOF structure, using Mg-MOF-74. Amines are currently used as a chemical absorbent in CO2 capture. Mg-MOF-74’s properties were first examined using x-ray diffraction and BET surface area analysis, as well as CO2 capture tests before and after steam treatments. This MOF was then synthesized and functionalized with amine groups at open coordinate sites in the hope of improving CO2 capture and protect the MOF from degradation. It was found that the modified MOF had improved CO2 capture, and was more resistant to degradation in the presence of humidity. Strikingly, the MOF showed no loss in capacity after extreme steam treatments when functionalized with amine groups, suggesting that the addition of amines could successfully mitigate the effects of humidity on the MOF structure.