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

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

Renewable Energy, 2024, vol. 229, issue C

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.

Keywords: Biomass; Simultaneous activation and nitrogen doping; Porous N-Doped biochar; Interaction mechanism; N-containing groups; H2 (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:229:y:2024:i:c:s0960148124008450

DOI: 10.1016/j.renene.2024.120777

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