Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF‐8 via Postsynthetic Modification |
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| Authors: | Zhijuan Zhang Shikai Xian Qibin Xia Haihui Wang Zhong Li Jing Li |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, South China University of Technology, , Guangzhou, 510640 P.R. China;2. Dept. of Chemistry and Chemical Biology, Rutgers University, , Piscataway, New Jersey, 08854 |
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| Abstract: | Imidazolate framework ZIF‐8 is modified via postsynthetic method using etheylenediamine to improve its adsorption performance toward CO2. Results show that the BET surface area of the modified ZIF‐8 (ED‐ZIF‐8) increases by 39%, and its adsorption capacity of CO2 per surface area is almost two times of that on ZIF‐8 at 298 K and 25 bar. H2O uptake on the ED‐ZIF‐8 become obviously lower compared to the ZIF‐8. The ED‐ZIF‐8 selectivity for CO2/N2 adsorption gets significantly improved, and is up to 23 and 13.9 separately at 0.1 and 0.5 bar, being almost twice of those of the ZIF‐8. The isosteric heat of CO2 adsorption (Qst) on the ED‐ZIF‐8 becomes higher, while Qst of N2 gets slightly lower compared to those on the ZIF‐8 Furthermore, it suggests that the postsynthetic modification of the ZIF‐8 not only improves its adsorption capacity of CO2 greatly, but also enhances its adsorption selectivity for CO2/N2/H2O significantly. ©2013 American Institute of Chemical Engineers AIChE J, 59: 2195–2206, 2013 |
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| Keywords: | ZIF‐8 modification adsorption/gas isosteric heat of adsorption selectivity |
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