Typical flue gas streams have low concentrations of CO2 and high gas flow rates, making porous materials, such as zeolites, metal-organic frameworks (MOFs), and activated carbons promising options for the future separation/sequestration of CO2. These framework materials typically exhibit high internal surface areas allowing them to physically adsorb significant amounts of gas. While adsorption capacity is important, high selectivity and facile regeneration are pertinent properties for post-combustion capture. the selectivity of a porous adsorbent can be due to a number of effects such as exclusion due to the size/shape of the pores, adsorbent/adsorbate surface interactions, and varying diffusion rates between different components in a gas mixture. We report on the pertinent results from several of our recent investigations of low-pressure CO2/N2/O2 sorption in MOFs and exchanged derivatives of zeolite SSZ-13.[1-5] Insights in to the site-specific adsorption properties are obtained utilizing neutron powder diffraction combined with in situ CO2 adsorption.[1] L.J. Murray, M. Dinca, J. Yano, S. Chavan, S. Bordiga, C.M. Brown, and J.R. Long, J. Am. Chem. Soc. 2010, 132, 7856[2] K. Sumida, S. Horike, S.S. Kaye, Z.R. Herm,W.L. Queen, C.M. Brown, F. Grandjean, G.J. Long, A. Dailly, and Jeffrey R. Long, Chem. Sci. 2010, 1, 184[3] Character of CO2 and CO adsorbed in a redox-active Fe-containing Metal-Organic Framework, W.L. Queen et al. to be submitted.[4] Role of Cation-Exchange in Highly Selective CO2 Adsorption Properties of Chabazite-type Zeolite SSZ-13, M.R. Hudson et al., to be submitted[5] Site Specific CO2 Adsorption and Zero Thermal Expansion in an Anisotropic Pore Network, W.L. Queen et al. submitted.

Structures and properties of CO<sub>2</sub> adsorbed in porous materials

243rd National Meeting (2012)

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Structures and properties of CO2 adsorbed in porous materials

Structures and properties of CO₂ adsorbed in porous materials