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Journal Articles Fuel Processing Technology Year : 2023

Transformation of nitrogen during solar pyrolysis of algae in molten salt

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Abstract

Molten salt pyrolysis of N-rich algae driven by concentrated solar energy is considered as an economical and environmentally friendly method to prepare N-doped value-added carbon. The transformation of nitrogen during the carbon production process by algae pyrolysis in molten Na2CO3-K2CO3 is investigated in-depth, which contributes to the utilization or treatment of nitrogen-containing products. Algae-N is mainly converted to gassingle bondN, and the gas-N yield increases as temperature rises, reaching 75.7 wt.% at 900 °C. Molten salt reduces the release temperature of all N-containing gas, captures 89.6% of HCN as CN−, and promotes the release of NH3 and NO. The char-N is dominated by pyrrole-N and quaternary-N at 800–900 °C due to the promotion of molten salt and higher temperature. The major contributors to the bio-oil-N yield are pentadecanenitrile, isoamyl cyanide, benzyl nitrile, styryl cyanide, pyrrole and indole. Nitriles and indoles are promising N-containing products in value-added carbon production, while NH3 and NO are primary pollution gas to be controlled.
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Jing Peng, Jun Li, Dian Zhong, Kuo Zeng, Kang Xu, et al.. Transformation of nitrogen during solar pyrolysis of algae in molten salt. Fuel Processing Technology, 2023, 242, pp.107664. ⟨10.1016/j.fuproc.2023.107664⟩. ⟨hal-03949350⟩
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