TY - JOUR
T1 - Microwave synthesis and characterization of MOF-74 (M = Ni, Mg) for gas separation
AU - Wu, Xiaofei
AU - Bao, Zongbi
AU - Yuan, Bin
AU - Wang, Jun
AU - Sun, Yingqiang
AU - Luo, Hongmei
AU - Deng, Shuguang
N1 - Funding Information:
This project was partially supported by U.S. Air Force Research Laboratory (FA8650-11-C-2127), U.S. Department of Energy (DE-EE0003046), U.S. National Science Foundation (EEC 1028968), New Mexico State University Office of Vice President for Research (GREG award for X. Wu), and the Hengyi Fund of Zhejiang University (S. Deng). S. Deng is grateful for the U.S. Department of State for the Fulbright award (Distinguished Chair in Energy Conservation) and his host institute (NUST, MISiS) in Moscow, Russia.
PY - 2013
Y1 - 2013
N2 - Isostructural MOF-74 (M = Ni, Mg) were successfully synthesized with both hydrothermal method (1 and 3) and microwave-assisted method (2 and 4). These MOF-74 samples were characterized with scanning electron microscopy for crystal structure, powder X-ray diffraction for phase structure, and nitrogen adsorption for pore textural properties. The experimental results showed that MOF-74 samples synthesized by the microwave-assisted method had a smaller particle size with relatively more uniform particle size distribution. The microwave effects also helped to produce a larger specific surface area and micropore volume, with a similar median pore diameter. Adsorption equilibrium and kinetics of various gases (CO2, CH4, N2, C2H 4, C2H6, C3H6 and C 3H8) on these MOF-74 samples were determined at 298 K and gas pressures up to 1 bar. Adsorption equilibrium selectivity (α), combined equilibrium and kinetic selectivity (β), and adsorbent selection parameter for pressure swing adsorption processes (S) were estimated. The relatively high values of adsorption selectivity indicates the potential to separate CO2/CH4, CO2/N2, C 2H4/C2H6, C3H 6/C3H8 and C3H6/C 2H4 pairs in a vacuum swing adsorption process using the MOF-74 as adsorbent. The microwave-assisted method was found to improve MOF-74 with a larger adsorption capacity and somewhat higher selectivity for gas separation.
AB - Isostructural MOF-74 (M = Ni, Mg) were successfully synthesized with both hydrothermal method (1 and 3) and microwave-assisted method (2 and 4). These MOF-74 samples were characterized with scanning electron microscopy for crystal structure, powder X-ray diffraction for phase structure, and nitrogen adsorption for pore textural properties. The experimental results showed that MOF-74 samples synthesized by the microwave-assisted method had a smaller particle size with relatively more uniform particle size distribution. The microwave effects also helped to produce a larger specific surface area and micropore volume, with a similar median pore diameter. Adsorption equilibrium and kinetics of various gases (CO2, CH4, N2, C2H 4, C2H6, C3H6 and C 3H8) on these MOF-74 samples were determined at 298 K and gas pressures up to 1 bar. Adsorption equilibrium selectivity (α), combined equilibrium and kinetic selectivity (β), and adsorbent selection parameter for pressure swing adsorption processes (S) were estimated. The relatively high values of adsorption selectivity indicates the potential to separate CO2/CH4, CO2/N2, C 2H4/C2H6, C3H 6/C3H8 and C3H6/C 2H4 pairs in a vacuum swing adsorption process using the MOF-74 as adsorbent. The microwave-assisted method was found to improve MOF-74 with a larger adsorption capacity and somewhat higher selectivity for gas separation.
KW - Adsorption
KW - Gas separation
KW - MOF-74
KW - Microwave-assisted synthesis
KW - Selectivity
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U2 - 10.1016/j.micromeso.2013.06.023
DO - 10.1016/j.micromeso.2013.06.023
M3 - Article
AN - SCOPUS:84880307887
SN - 1387-1811
VL - 180
SP - 114
EP - 122
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -