Porous materials made up of metal clusters connected by organic linkers, known as metal-organic frameworks (MOFs), are promising materials for CO2 capture. Carboxylate MOFs hold records for high heats of adsorption and large surface areas, both ideal for CO2 capture. Water exposure, however, often leads to framework decomposition which is an issue when capturing CO2 from flue gas.1In this study, three common MOFs were post-synthetically modified with silica: Mg2(1,4-dioxido-2,5-benzenedicarboxylate) (Mg-MOF-74), Cu3(1,3,5-benzenetricarboxylate)2 (HKUST-1), and Al(OH)(1,4-benzenedicarboxylate) (Al-MIL-53), via a new reproducible method. CO2 adsorption indicated a decrease in the number of open metal sites post-modification. Heats of CO2adsorption were retained in the modified materials, indicating the success of this post-synthetic modification technique. Effect on water stability will also be reported.1. Schoenecker, P.; Carson, C.; et. al. Ind. Eng. Chem. Res. 2012  , 51, 6513�6519.

Reproducible post-synthetic modification of MOFs toward increased water stability

245th National Meeting (2013)

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