Nitrogen-enriched carbonaceous materials with hierarchical micro-mesopore structures for efficient CO₂ capture

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• 作者：Hongwei Yang^a ; ^b ; Youzhu Yuan^b ; Shik Chi Edman Tsang^a ; ^{edman.tsang@chem.ox.ac.uk}
• 关键词：CO2 capture ; Carbonaceous material ; Carboxyl rich ; Hierarchical micro-mesopore structure ; Amine modification
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 March, 2012
• 卷：185-186
• 期：Complete
• 页码：374-379
• 文件大小：712 K

摘要

Carboxyl-rich porous carbons (CPCs) derived from glucose are prepared by a hydrothermal method in the presence of acrylic acid and non-ionic surfactant Brij 72 as structure-directing agents. Tetraethylenepentamine molecules are then grafted onto the surfaces of CPCs via acylation-amidation route, yielding nitrogen-enriched porous carbons (NPCs). Material characterizations reveal that the CPCs display high surface areas with micro and mesoporous structures. Despite the surface functionalization of CPCs via acylation-amidation route the porous structures of NPCs are maintained. As a result, the NPCs exhibit excellent CO₂ capture capacity (3.2 mmol g^鈭?) with high selectivity of CO₂ over N₂ (>46) at 298 K and 1 bar. In addition, good reversibility of CO₂ adsorption can be achieved at different temperatures.