Utilizing the Gate-Opening Mechanism in ZIF-7 for Adsorption Discrimination between N2O and CO2

详细信息    查看全文

• 作者：De-Li Chen ; Ningwei Wang ; Fang-Fang Wang ; Jianwu Xie ; Yijun Zhong ; Weidong Zhu ; J. Karl Johnson ; Rajamani Krishna
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 7, 2014
• 年：2014
• 卷：118
• 期：31
• 页码：17831-17837
• 全文大小：303K
• ISSN：1932-7455

文摘

N₂O is a greenhouse gas with tremendous global warming potential, and more importantly it also causes ozone depletion; thus, the separation of N₂O from industrial processes has gained significant attention. We have demonstrated that N₂O can be selectively separated from CO₂ using the zeolite imidazolate framework ZIF-7. The adsorption/desorption isotherms of both N₂O and CO₂ in ZIF-7 indicate the gate-opening mechanism of this material, and surprisingly, the threshold pressure for the gate opening with N₂O is lower than that with CO₂. Theoretical calculations indicate that both gas鈥揾ost and gas鈥揼as interaction energies for N₂O are more favorable than those for CO₂, giving rise to the difference in the threshold pressure between N₂O and CO₂ in ZIF-7. Breakthrough experiments for N₂O/CO₂ mixtures confirm that ZIF-7 is capable of separating N₂O and CO₂ mixtures under the optimized conditions, in reasonable agreement with simulation results, making it a promising material for industrial applications.