CO2 Adsorption Enhancement in MOF-808 via a Highly Efficient Amine Incorporation

We present a facile means of carbon capture porous solid sorbent synthesis using limited synthetic steps and low-cost reagents that results in a high density of primary alkyl amines distributed through a zirconium-based metal organic framework (MOF). Both the MOF synthesis and the post synthetic modification take place under aqueous conditions and result in strongly bound molecular amines available for sorbate interaction throughout the MOF pores. This amine incorporation protocol results in a significantly increased CO2 capacity compared with the unmodified MOF-808. Specifically, CO2 isotherms for the unmodified MOF-808 show uptakes of 0.06, 0.20, and 1.16 mmol/g at 4, 15, and 100 kPa, respectively, which can be compared with 0.45, 0.85, and 2.3 mmol/g for ethylenediamine grafted MOF-808.