期刊
BIORESOURCE TECHNOLOGY
卷 286, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121385
关键词
Nitrogen conversion; Spirulina; Hydrothermal carbonization; Medium-low temperature
资金
- National Natural Science Foundation of China [51679083]
- scientific and technological project of Changsha City [KQ1801011]
- key research and development project of Hunan Province [2018WK2011]
- Open funding of the Key Laboratory of tropical & Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, P.R. China
- Hunan Provincial Innovation Foundation For Postgraduate [CX2018B194]
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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