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Synthesis of Zeolitic Imidazolate Framework ZIF-7 and Application for CO2 and CH4 Separation

Xiaofei Wu1, Mehdi Niknam2, Bin Yuan3 and Shuguang Deng3, (1)Chemical Engineering, New Mexico State University, Las cruces, NM, (2)New Mexico State University, Las Cruces, NM, (3)Chemical Engineering, New Mexico State University, Las Cruces, NM

Synthesis of Zeolitic Imidazolate Framework ZIF-7 and Application for CO2 and CH4 Separation

Xiaofei Wu, Mehdi Niknam, Bin Yuan, Shuguang Deng

New Mexico State University

Chemical Engineering Department

Las Cruces, NM 88003

Zeolitic imidazolate framework ZIF-7 is synthesized by both conventional hydrothermal method and microwave-assisted methods. The cubic structures of these two ZIF-7 samples obtained in this work are confirmed by X-ray powder diffraction results. The scanning electron microscopy (SEM) images of these two samples reveal that they have different particle sizes. The pore textural properties obtained by carbon dioxide adsorption at 0ºC also indicate that they have different pore structures. Adsorption equilibrium and kinetics of CO2 and CH4 on these two samples are determined at various temperatures and gas pressures up to 1 bar, which match the simulated results. The combined equilibrium and kinetic selectivity is calculated from the adsorption isotherms and the adsorption kinetic plots, the results show that both of these two ZIF-7 samples have a good selectivity of separating CO2 and CH4.

 

 

Keywords: Adsorption, CO2/CH4 separation, microwave-assisted synthesis, ZIF-7

 


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See more of this Session: Separations Needs for CO2 Capture II
See more of this Group/Topical: Separations Division