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

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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 H 2 O 2 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 CO 2 /N 2 selectivity, stable reusability, high initial heat of CO 2 adsorption, and high dynamic CO 2 capture capacity under simulated flue gas conditions. These superior CO 2 adsorption properties make them highly competitive among all the carbonaceous adsorbents for CO 2 capture.