Carbon dioxide capture using polyethylenimine-loaded mesoporous carbons

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• 作者：Jitong Wang ^{wjt19850601@126.com} ; Huichao Chen ; Huanhuan Zhou ; Xiaojun Liu ; Wenming Qiao ; Donghui Long ; ^{longdh@ecust.edu.cn} ; Licheng Ling
• 关键词：carbon dioxide capture ; polyethylenimine ; mesoporous carbon ; amine utilization ratio
• 刊名：Journal of Environmental Sciences
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：25
• 期：1
• 页码：124-132
• 全文大小：1394 K

文摘

A high efficiency sorbent for CO₂ capture was developed by loading polyethylenimine (PEI) on mesoporous carbons which possessed well-developed mesoporous structures and large pore volume. The physicochemical properties of the sorbent were characterized by N₂ adsorption/desorption, scanning electron microscopy (SEM), thermal gravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR) techniques followed by testing for CO₂ capture. Factors that affected the sorption capacity of the sorbent were studied. The sorbent exhibited extraordinary capture capacity with CO2 concentration ranging from 5 % to 80 % . The optimal PEI loading was determined to be 65 wt. % with a CO₂ sorption capacity of 4.82 mmol-CO₂/g-sorbent in 15 % CO₂/N₂ at 75¡ãC, owing to low mass-transfer resistance and a high utilization ratio of the amine compound (63 % ). Moisture had a promoting effect on the sorption separation of CO₂. In addition, the developed sorbent could be regenerated easily at 100¡ãC, and it exhibited excellent regenerability and stability. These results indicate that this PEI-loaded mesoporous carbon sorbent should have a good potential for CO2 capture in the future.