N-doped porous carbons from low-temperature and single-step sodium amide activation of carbonized water chestnut shell with excellent CO2 capture performance

By Linli Rao, Shenfang Liu, Linlin Wang, Chang Ma, Jiayi Wu, Liying An, Xin Hu. Chemical Engineering Journal, 2019

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Abstract The aim of this study is to exploit low-cost N-doped porous carbonaceous adsorbents with excellent CO2 adsorption properties. Herein, the N-enriched porous carbons were obtained through a single-step sodium amide activation of carbonized water chestnut shell at 400–500 °C. The optimal sample possesses high CO2 uptake of 4.50 mmol/g (25 °C) and 6.04 mmol/g (0 °C) at atmospheric pressure. Additionally, this sample displays high CO2/N2 selectivity, stable cyclic ability, moderate CO2 isosteric heat of adsorption, fast CO2 adsorption rate, and high dynamic CO2 uptake. In addition to the two well-known factors i.e. volume of narrow micropore and N content, the pore size distribution is also found to play major role in deciding CO2 adsorption performance for these adsorbents. The features of excellent CO2 adsorption properties, low-cost raw materials, low reaction temperature and facile preparation demonstrate that these adsorbents are prospective in the application of CO2 capture.

Subfields: Inorganic Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e4fba46d6941be8a7cb3a85718685840137e917a