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The DOI matches its Crossref record; 47 of the 47 references it cites were found in a registry or an index.

Transformation of Nitrogen and Evolution of N-Containing Species during Algae Pyrolysis

Chen, Wei, Yang, Haiping, Chen, Yingquan, Xia, Mingwei, Chen, Xu, Chen, Hanping·2017·Environmental Science & Technology

Abstract

Transformation and evolution mechanisms of nitrogen during algae pyrolysis were investigated in depth with exploration of N-containing products under variant temperature. Results indicated nitrogen in algae is mainly in the form of protein-N (∼90%) with some inorganic-N. At 400–600 °C, protein-N in algae cracked first with algae pyrolysis and formed pyridinic-N, pyrrolic-N, and quaternary-N in char. The content of protein-N decreased significantly, while that of pyrrolic-N and quaternary-N increased gradually with temperature increasing. Pyridinic-N and pyrrolic-N formation was due to deamination or dehydrogenation of amino acids; subsequently, some pyridinic-N converted to quaternary-N. Increasing temperature decreased amides content greatly while increased that of nitriles and N-heterocyclic compounds (pyridines, pyrroles, and indoles) in bio-oil. Amides were formed through NH 3 reacting with fatty acids, that underwent dehydration to form nitriles. Besides, NH 3 and HCN yields increased gradually. NH 3 resulted from ammonia-N, labile amino acids and amides decomposition, while HCN came from nitrile decomposition. At 700–800 °C, evolution trend of N-containing products was similar to that at 400–600 °C. While N-heterocyclic compounds in bio-oil mainly came from pyrifinic-N, pyrrolic-N, and quaternary-N decomposition. Moreover, cracking of pyridinic-N and pyrrolic-N produced HCN and NH 3 . A mechanism of nitrogen transformation during algae pyrolysis is proposed based on amino acids decomposition.

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Metadata

Authors
Chen, W., Yang, H., Chen, Y., Xia, M., Chen, X., & Chen, H.
Venue
Environmental Science & Technology
Published
2017-05-19
Volume
51
Issue
11
Pages
6570-6579
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2613377412
Cited by
444
References
47
FWCI
8.73
Type
journal article
Language
en
Open access
closed

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