Role of Hydrogen Peroxide Preoxidizing on CO2 Adsorption of Nitrogen-Doped Carbons Produced from Coconut Shell

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• 作者：Liping Guo ; Jie Yang ; Gengshen Hu ; Xin Hu ; Linlin Wang ; Yifan Dong ; Herbert DaCosta ; Maohong Fan
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：May 2, 2016
• 年：2016
• 卷：4
• 期：5
• 页码：2806-2813
• 全文大小：558K
• 年卷期：0
• ISSN：2168-0485

文摘

In this work, the coconut shell was preoxidized by hydrogen peroxide, before it was treated by the ammoxidation process and potassium hydroxide activation to synthesize nitrogen-doped porous carbons. The resulting sorbents exhibit significantly higher nitrogen content and narrow microporosity than the control sample without H₂O₂ pretreatment. Consequently, these sorbents are found to demonstrate high carbon dioxide uptake at 1 bar, such as 4.47 mmol g^–1 at 25 °C and 6.79 mmol g^–1 at 0 °C. In addition, these sorbents possess high CO₂/N₂ selectivity, stable reusability, high initial heat of CO₂ adsorption, and high dynamic CO₂ capture capacity under simulated flue gas conditions. These superior CO₂ adsorption properties make them highly competitive among all the carbonaceous adsorbents for CO₂ capture.