Speciation and transformation of nitrogen for spirulina hydrothermal carbonization

文献类型： 外文期刊

第一作者： Xiao, Huan

作者： Xiao, Huan;Zhai, Yunbo;Wang, Tengfei;Wang, Bei;Li, Shanhong;Li, Caiting;Xiao, Huan;Zhai, Yunbo;Wang, Tengfei;Wang, Bei;Li, Shanhong;Li, Caiting;Xie, Jun

作者机构：

关键词： Nitrogen conversion; Spirulina; Hydrothermal carbonization; Medium-low temperature

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）

ISSN： 0960-8524

年卷期： 2019 年 286 卷

页码：

收录情况： SCI

摘要： Nitrogen conversion (N-conversion) mechanism of spirulina (SP) in hydrothermal carbonization (HTC) was investigated under medium-low temperature (180-280 degrees C). N-conversion in bio-char, liquid and bio-oil were studied by FTIR, XPS, GC-MS and other analytical methods. Results indicated that the temperature could significantly affect the evolution of nitrogen. At 180-200 degrees C, the content of protein-N and pyridine-N in bio-char fell 23.01% and 9.51% respectively. In contrast, the contents of inorganic-N and quaternary-N increased by 16.99% and 16% respectively. Protein-N hydrolysis and Maillard reaction produced the key intermediate compounds, including amines, amides and N-heterocyclic compounds during the HTC. At 200-280 degrees C, the inorganic-N was obviously converted from solid to liquid. With the increased of temperature, it would enhance the polymerization of pyrrole-N and pyridine-N, which could cause the significant increase of aromatic N-heterocyclic compounds (e.g., nitriles and indole derivatives) in bio-oil. A N-conversion mechanism of SP HTC was proposed in this study.

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