Polyfuran-Derived Microporous Carbons for Enhanced Adsorption of CO2 and CH4

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• 作者：Jun Wang ; Rajamani Krishna ; Xiaofei Wu ; Yingqiang Sun ; Shuguang Deng
• 刊名：Langmuir
• 出版年：2015
• 出版时间：September 15, 2015
• 年：2015
• 卷：31
• 期：36
• 页码：9845-9852
• 全文大小：649K
• ISSN：1520-5827

文摘

Oxygen-doped microporous carbons were synthesized by chemical activation of polyfuran with KOH or ZnCl₂ at 600 and 800 掳C. It was found that KOH preserves and ZnCl₂ eliminates the O鈥揅 functional groups in the activation process. The O-doped carbon activated with KOH at 800 掳C exhibited a high CO₂ capacity (4.96 mmol g^鈥?, 273 K, 1 bar) and CH₄ adsorption capacity (2.27 mmol g^鈥?, 273 K, 1 bar). At 298 K and 1 bar, a very high selectivity for separating CO₂/N₂ (41.7) and CO₂/CH₄ (6.8) gas mixture pairs was obtained on the O-doped carbon activated with KOH at 600 掳C. The excellent separation ability of the O-doped carbons was demonstrated in transient breakthrough simulations of CO₂/CH₄/N₂ mixtures in a fixed bed adsorber. The isosteric adsorption heats of the O-doped carbons were also significantly lower than those of MOF-74 and NaX zeolite. The O-doped microporous carbon adsorbents appear to be a very promising adsorbent for CO₂ capture from flue gas, biogas upgrading, and CH₄ storage.