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Selective CO 2 Capture from Flue Gas Using Metal–Organic Frameworks―A Fixed Bed Study

2012; American Chemical Society; Volume: 116; Issue: 17 Linguagem: Inglês

10.1021/jp300961j

1932-7455

Jian Liu, Jian Tian, Praveen K. Thallapally, B. Peter McGrail,

Membrane Separation and Gas Transport

It is important to capture carbon dioxide from flue gas, which is considered one of to be the main cause of global warming. CO2/N2 separation by novel adsorbents is a promising method for reducing CO2 emission. Meanwhile, water effects on CO2 adsorption and CO2/N2 selectivity is critical to enable utilization of the adsorbents in practical applications. In this paper, Ni/DOBDC (Ni-MOF-74 or CPO-27-Ni) was synthesized through a solvothermal reaction, and the pellet sample was used in a fixed-bed CO2/N2 breakthrough study with and without H2O. The Ni/DOBDC pellet has a high CO2 capacity of 3.74 mol/kg at 0.15 bar and a high CO2/N2 selectivity of 38, which is much higher than those of reported metal–organic frameworks and zeolites under dry conditions. Trace amounts of water can affect CO2 adsorption capacity as well as CO2/N2 selectivity for the Ni/DOBDC. However, Ni/DOBDC can retain a significant CO2 capacity of 2.2 mol/kg and a CO2/N2 selectivity of 22 at 0.15 bar CO2 with 3% RH water. These results indicate a promising future for use of the Ni/DOBDC in capturing CO2 from flue gas.