title: Adsorption of carbon dioxide, methane and nitrogen on an ultramicroporous copper metal-organic framework.
abstract: An ultramicroporous copper metal-organic framework (Cu-MOF), Cu(hfipbb)(H2hfipbb)0.5 [H2hfipbb=4,4'-(hexafluoro-isopropylidene) bis(benzoic acid)] was successfully synthesized by a microwave-assisted method (1) with a shorter reaction time and higher MOFs yield. The obtained Cu-MOF sample was characterized with scanning electron microscopy for crystal structure, powder X-ray diffraction for phase structure, and carbon dioxide adsorption at 273 K for pore textural properties. Single-component adsorption (adsorption equilibrium and kinetics) of CO2, CH4, and N2 on 1 was measured using a Micromeritics ASAP 2020 adsorption porosimeter at 278, 298 and 318 K, and pressures up to 1 bar. Isosteric heats of adsorption, Henry's constants, and diffusion time constants were calculated and carefully analyzed. Adsorption equilibrium selectivity (α), adsorbent selection parameter for pressure swing adsorption processes (S), kinetic selectivity and combined separation selectivity (β) for CO2/CH4, CO2/N2 and CH4/N2 binary mixtures were estimated based on the single-component adsorption data. The relative high values of the adsorption selectivities suggest that Cu-MOF is a promising adsorbent for separating CO2/CH4, CO2/N2 and CH4/N2 gas pairs.
authors.affiliation: Chemical & Materials Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Wu
authors.affiliation: Chemical & Materials Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
authors.forename: Bin
authors.initials: B
authors.lastname: Yuan
authors.affiliation: Chemical and Biological Engineering Department, Zhejiang University, Hangzhou 310027, China.
authors.forename: Zongbi
authors.initials: Z
authors.lastname: Bao
authors.affiliation: Chemical & Materials Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA; Chemical and Biological Engineering Department, Zhejiang University, Hangzhou 310027, China. Electronic address: sdeng@nmsu.edu.
authors.forename: Shuguang
authors.initials: S
authors.lastname: Deng
keywords: Adsorption; Carbon dioxide; Cu-MOF; Methane; Microwave-assisted synthesis; Nitrogen; Separation