Advanced solid adsorbents have the potential to decrease significantly the cost of CO2 removal from the effluent streams of fossil fuel-burning power plants. Here, the gas adsorption properties for a series of diamine-functionalized metal-organic frameworks, related to the well-known MOF-74 structure, will be presented. Owing to the unusual isotherm shapes for some of these materials, we will demonstrate that metal-organic frameworks with large adsorption enthalpies can be suitable for CO2 capture applications. Working capacities in excess of 10 wt % can be achieved for cyclic processes utilizing temperature swings of as little as 50 �C without applied vacuum. Adsorbent regeneration energies 25-45% lower than those achievable employing state-of-the-art aqueous amine solutions will be shown to be feasible. The stability of amine-functionalized adsorbents to the presence of flue gas contaminants, including H2O and SO2, will be presented. Spectroscopic evidence of the proposed adsorption mechanism and the role of the metal-organic framework in determining adsorption properties will be discussed.

Diamine-appended metal-organic frameworks as tunable adsorbents for efficient carbon dioxide capture

248th National Meeting (2014)

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