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Co-production of porous N-doped biochar and hydrogen-rich gas production from simultaneous pyrolysis-activation-nitrogen doping of biomass: Synergistic mechanism of KOH and NH3

Author

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  • Wang, Yurou
  • Guo, Wenjuan
  • Chen, Wei
  • Xu, Gongxun
  • Zhu, Guoqiang
  • Xie, Geliang
  • Xu, Lujiang
  • Dong, Chengyu
  • Gao, Shuai
  • Chen, Yingquan
  • Yang, Haiping
  • Chen, Hanping
  • Fang, Zhen

Abstract

In this study, a method of simultaneous activation and nitrogen doping during biomass fast pyrolysis for co-production of porous N-doped biochar and H2-rich gas production was proposed. The effect of temperature on chemical interaction mechanism of KOH and NH3 was investigated at 500–800 °C. Results showed that KOH and NH3 had a synergistic effect on pore development and nitrogen doping, and the specific surface area and nitrogen content reached maximum values of 2008.37 m2/g and 5.05 wt%, respectively. It may be due to that NH3 entered pores generating by KOH activation for further activation, and at the same time, excessive NH3 could convert new O-containing groups to N-containing groups for more effective nitrogen doping. What's more, the H2 concentration and yield were up to 56.67 vol% and 517.95 mL/g, respectively. It indicates that the synchronization method of fast pyrolysis-activation-nitrogen doping is a promising approach, which is of great significance for the high-value utilization of biomass.

Suggested Citation

  • Wang, Yurou & Guo, Wenjuan & Chen, Wei & Xu, Gongxun & Zhu, Guoqiang & Xie, Geliang & Xu, Lujiang & Dong, Chengyu & Gao, Shuai & Chen, Yingquan & Yang, Haiping & Chen, Hanping & Fang, Zhen, 2024. "Co-production of porous N-doped biochar and hydrogen-rich gas production from simultaneous pyrolysis-activation-nitrogen doping of biomass: Synergistic mechanism of KOH and NH3," Renewable Energy, Elsevier, vol. 229(C).
    • Handle: RePEc:eee:renene:v:229:y:2024:i:c:s0960148124008450
    DOI: 10.1016/j.renene.2024.120777
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    Keywords

    Biomass; Simultaneous activation and nitrogen doping; Porous N-Doped biochar; Interaction mechanism; N-containing groups; H2;
    All these keywords.

    JEL classification:

    • H2 - Public Economics - - Taxation, Subsidies, and Revenue

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