Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF-8 via Postsynthetic Modification

被引：188

作者：

Zhang, Zhijuan ^{[1
,2
]}

Xian, Shikai ^{[1
]}

Xia, Qibin ^{[1
]}

Wang, Haihui ^{[1
]}

Li, Zhong ^{[1
]}

Li, Jing ^{[2
]}

机构：

[1] S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China

[2] Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA

来源：

AICHE JOURNAL | 2013年 / 59卷 / 06期

基金：

中国国家自然科学基金;

关键词：

ZIF-8; modification; adsorption; gas; isosteric heat of adsorption; selectivity; METAL-ORGANIC FRAMEWORK; ZEOLITIC IMIDAZOLATE FRAMEWORKS; CARBON-DIOXIDE CAPTURE; GAS-MIXTURES; ACTIVATED CARBON; HIGH-CAPACITY; PORE-SIZE; SEPARATION; BINDING; FUNCTIONALIZATION;

D O I：

10.1002/aic.13970

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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. (c) 2013 American Institute of Chemical Engineers AIChE J, 59: 21952206, 2013

引用

页码：2195 / 2206

页数：12

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