Direct Carbonization of Cyanopyridinium Crystalline Dicationic Salts into Nitrogen-Enriched Ultra-Microporous Carbons toward Excellent CO2 Adsorption

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• 作者：Guojian Chen ; Xiaochen Wang ; Jing Li ; Wei Hou ; Yu Zhou ; Jun Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：7
• 期：33
• 页码：18508-18518
• 全文大小：691K
• ISSN：1944-8252

文摘

A family of nitrogen-enriched ultramicroporous carbon materials was prepared by direct carbonization of task-specifically designed molecular carbon precursors of cyanopyridinium-based crystalline dicationic salts (CISs). Varying the molecular structure of CISs, large surface area (918 m² g^鈥?), high N content (20.10 wt %), and narrow distributed ultramicropores (0.59 nm) can be simultaneously achieved on the sample PCN-14 derived from methyl-linked 4-cyanopyridinium D[4-CNPyMe]Tf₂N. It therefore exhibited exceptional performance in greenhouse gas CO₂ capture, i.e., simultaneously possessing (1) high CO₂ adsorption uptakes: 5.33 mmol g^鈥? at 273 K, and 3.68 mmol g^鈥? at 298 K (both at 1.0 bar); (2) unprecedented selectivity of CO₂ versus N₂: 156; and (3) a high adsorption ratio of CO₂ to N₂: 148 (at 1.0 bar). This is the first time such a high selectivity and adsorption ratio over carbon materials has been achieved, which is among the highest values over solid adsorbents.