Research Article pubs.acs.org/journal/ascecg
Role of Hydrogen Peroxide Preoxidizing on CO2 Adsorption of Nitrogen-Doped Carbons Produced from Coconut Shell Liping Guo,† Jie Yang,† Gengshen Hu,‡ Xin Hu,*,† Linlin Wang,§ Yifan Dong,† Herbert DaCosta,∥ and Maohong Fan⊥ †
College of Chemistry and Life Sciences, Zhejiang Normal University, 688 Yingbin Avenue, Jinhua 321004, People’s Republic of China ‡ Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, 688 Yingbin Avenue, Jinhua 321004, People’s Republic of China § College of Engineering, Zhejiang Normal University, 688 Yingbin Avenue, Jinhua 321004, People’s Republic of China ∥ Math, Science, and Engineering Division, Illinois Central College, 1 College Drive, East Peoria, Illinois 61635, United States ⊥ Department of Chemical and Petroleum Engineering, University of Wyoming, 1000 E. University Avenue, Laramie, Wyoming 82071, United States S Supporting Information *
ABSTRACT: 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. KEYWORDS: CO2 adsorption, Nitrogen-doped porous carbons, H2O2 preoxidizing, ammoxidation, KOH activation, renewable biomass resource
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and high resistance to water vapor.12,22−24 Recent studies have shown that the CO2 adsorption capacities of porous carbons under ambient condition are significantly dependent on the existence of narrow micropores (
