High-pressure separations of binary and ternary mixtures of CO2, CH4, and H2 are relevant to pre-combustion carbon dioxide capture. Metal-organic frameworks represent a class of porous materials that could be used to accomplish these separations. Selected metal-organic frameworks exhibiting representative properties�high surface area, structural flexibility, or the presence of open metal cation sites�were tested for utility in the separation of CO2 from H2 via pressure swing adsorption. Single-component CO2 and H2 adsorption isotherms were measured at 313 K and pressures up to 40 bar. Metal-organic frameworks exhibiting open metal sites, specifically Mg2(dobdc) (dobdc4� = 1,4-dioxido-2,5-benzenedicarboxylate), perform especially well for this separation. Due to CH4 impurities present in natural gas combustion, high pressure CH4, CO2 and H2 adsorption behavior are also analyzed using the ideal adsorbed solution theory to model a CO2/CH4/H2 mixture separation using Mg2(dobdc). The selectivities, working capacities and breakthrough performances for this mixture is reported.

Metal-organics as adsorbents for precombustion carbon dioxide capture

243rd National Meeting (2012)

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