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Chemistry and Industry of Forest Products ›› 2021, Vol. 41 ›› Issue (2): 1-9.doi: 10.3969/j.issn.0253-2417.2021.02.001

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Preparation and CO2 Adsorption Performance of Larch-based N-doped Carbon Foam

Yuhang ZHANG1, Hao YING2, Wei LI1, Chunhui MA1, Sha LUO1, Shouxin LIU1,*()   

  1. 1. Key Laboratory of Bio-Based Material Science & Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
    2. Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China
  • Received:2020-11-18 Online:2021-04-28 Published:2021-05-08
  • Contact: Shouxin LIU E-mail:liushouxin@126.com

Abstract:

Larch-based N-doped carbon foam was prepared with larch sawdust as carbon source and urea as nitrogen source via phenol liquefaction-physical foaming-activation method. Morphology, surface chemical properties and pore structure of the prepared carbon foams were analyzed by SEM, XRD, XPS, TG and N2 adsorption-desorption isotherm. CO2 adsorption capacity and CO2/N2 adsorption selectivity of the materials were tested as well. Effects of nitrogen doping and activation temperature on CO2 adsorption performance were investigated. The results showed that carbon foam had the crystal structure of disordered stacking of graphene layers, and its disorder increased with the rise of activation temperature. Nitrogen doping reduces the size of cell and thermal stability. Nitrogen-doped carbon foam exhibited typical microporous structure with the maximum micropore content of 95.83%. The microporous pore size of nitrogen-doped carbon foams(NCF-4-900, NCF-6-900 and NCF-8-900) which were prepared under the conditions of activation temperature of 900 ℃ and urea doping amounts of 4, 6 and 8 g were mainly concentrated at 0.50, 0.81 and 1.26 nm, and the mesoporous pore size was concentrated in about 3.85 nm.The materials contained 3 types of nitrogen and they were mainly pyridine nitrogen(N-6) and pyrrole nitrogen(N-5) when the activation temperatures were 700 and 800 ℃. With the activation temperature reaching 900 ℃, some N-5 and N-6 were transformed into quaternary nitrogen(N-Q) with better thermal stability, and pyrrolic N was dominant. CO2 adsorption capacity increased with the rise of activation temperature. NCF-8-900 had the highest adsorption capacity(up to 3.19 mmol/g at 25 ℃ and 100 kPa) and excellent CO2/N2 adsorption selectivity of 118.63.

Key words: urea, carbon foam, CO2 adsorption, pore structure, adsorption selectivity

CLC Number: