Exceptional ammonia uptake by a covalent organic framework

被引：0
作者：
Doonan, Christian J. [1 ]
Tranchemontagne, David J. [1 ]
Glover, T. Grant [1 ]
Hunt, Joseph R. [1 ]
Yaghi, Omar M. [1 ]
机构：
[1] Univ Calif Los Angeles, Ctr Reticular Chem, Calif NanoSyst Inst, Dept Chem & Biochem, Los Angeles, CA 90095 USA
来源：
NATURE CHEMISTRY | 2010年 / 2卷 / 03期
关键词：
MECHANICAL STABILITY; RETICULAR SYNTHESIS; ADSORPTION; CRYSTALLINE; SORBENTS; MCM-41;
D O I：
10.1038/NCHEM.548
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Covalent organic frameworks (COFs) are porous crystalline materials composed of light elements linked by strong covalent bonds. A number of these materials contain a high density of Lewis acid boron sites that can strongly interact with Lewis basic guest, which makes them ideal for the storage of corrosive chemicals such as ammonia. We found that a member of the covalent organic framework family, COF-10, shows the highest uptake capacity (15 mol kg(-1), 298 K, 1 bar) of any porous material, including microporous 13X zeolite (9 mol kg(-1)), Amberlyst 15 (11 mol kg(-1)) and mesoporous silica, MCM-41 (7.9 mol kg(-1)). Notably, ammonia can be removed from the pores of COF-10 by heating samples at 200 degrees C under vacuum. In addition, repeated adsorption of ammonia into COF-10 causes a shift in the interlayer packing, which reduces its apparent surface area to nitrogen. However, owing to the strong Lewis acid-base interactions, the total uptake capacity of ammonia and the structural integrity of the COF are maintained after several cycles of adsorption/desorption.
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收藏
页码：235 / 238
页数：4
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