Study on CO2 adsorption properties of PEI-modified mesoporous molecular sieve KIT-6

被引：0
作者：
机构：
[1] Shanghai Advanced Research Institute, Chinese Academy of Sciences
[2] Institute of Coal Chemistry, Chinese Academy of Sciences
来源：
Wei, W. (weiwei@sari.ac.cn) | 1600年 / Zhejiang University卷 / 28期
关键词：
Adsorption separation; Carbon dioxide; KIT-6; Polyethylenimine;
D O I：
10.3969/j.issn.1003-9015.2014.01.026
中图分类号：
学科分类号：
摘要：
CO2 capture has gained great attention due to its accumulation in the atmosphere, which is widely agreed as the predominant cause of greenhouse effect. In order to find an efficient adsorbent with high CO2 adsorption capacity and separation selectivity, mesoporous silica KIT-6 was synthesized by hydrothermal method and its amine-functionalized by impregnating it with PEI (polyethylenimine). The CO2 adsorption performances of KIT-6 and its modified ones were evaluated by using a dynamic adsorption apparatus. The effects of different PEI-loading ratioes on the adsorption of CO2 were investigated by the changes of breakthrough time, adsorption capacity and separation coefficient. The results show that PEI-modified KIT-6 adsorbent could greatly enhance CO2 adsorption amount and the separation coefficient between CO2 and N2. The CO2 adsorption performance increases with PEI-loading and then decreases. When the PEI-loading ratio is 0.6, the adsorption amount of CO2 and the separation selectivity reach their maximum value of 2.09 mmol · g-1 and 30.56, respectively, which are 6.0 times and 7.2 times higher than that of KIT-6 without PEI loading. Moreover, the CO2 adsorption capacity of PEI-modifies KIT-6 increases with temperature. Besides, the saturated PEI-modified adsorbent can be fully regenerated at 378 K and the regenerated adsorbent shows fairly good stability in 20 cycles of adsorption/regeneration.
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页码：171 / 176
页数：5
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