NIST logo

Publication Citation: Selective Adsorption of CO2 from Light Gas Mixtures Using a Structurally Dynamic Porous Coordination Polymer

NIST Authors in Bold

Author(s): Winnie K. Wong-Ng; Andrew J. Allen; Laura Espinal; Kristi L. Kauffman; Jeffrey T. Culp; Angela Goodman; Thomas D. Brown; Mark P. Bernardo; Russel J. Pancoast; Danielle Chirdon; Christopher Matranga;
Title: Selective Adsorption of CO2 from Light Gas Mixtures Using a Structurally Dynamic Porous Coordination Polymer
Published: April 29, 2011
Abstract: The selective adsorption of CO2 from binary mixtures of N2 and CH4 was investigated using a structurally dynamic porous coordination polymer, catena-bis(dibenzoylmethanato)-(4,4‰bipyridyl)nickel (II), ,NiDBM-Bpy‰, as the separation sorbent. A third gas, N2O, was also evaluated that exhibits competitive, non-selective, nearly 1:1 co-adsorption with CO2. The analysis is based on three complementary techniques involving in situ attenuated total reflectance Fourier-transform infrared spectroscopy to probe adsorption of infrared active gases directly in the NiDBM-Bpy pore, gas chromatography to monitor gas composition changes in the headspace above the sorbent bed, and small angle neutron scattering to provide structural information on the porosity changes. These measurement techniques indicated highly selective adsorption of CO2 from CO2/CH4 and CO2/N2 mixtures at 30°C. In contrast, the results for the CO2/N2O system shows the two gases are adsorbed in nearly equal ratios.
Citation: Angewandte Chemie-International Edition
Volume: 50
Pages: pp. 10888 - 10892
Keywords: Porous coordination polymer; metal-organic framework; guest-induced structural transition; gas separations; infrared spectroscopy; headspace gas chromatography; small angle neutron scattering
Research Areas: Environment/Climate