- Title
- The transformation of nitrogen during pressurized entrained-flow pyrolysis of Chlorella vulgaris
- Creator
- Maliutina, Kristina; Tahmasebi, Arash; Yu, Jianglong
- Relation
- Bioresource Technology Vol. 262, Issue August 2018, p. 90-97
- Publisher Link
- http://dx.doi.org/10.1016/j.biortech.2018.04.073
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2018
- Description
- The transformation of nitrogen in microalgae during entrained-flow pyrolysis of Chlorella vulgaris was systematically investigated at the temperatures of 600–900 °C and pressures of 0.1–4.0 MPa. It was found that pressure had a profound impact on the transformation of nitrogen during pyrolysis. The nitrogen retention in bio-char and its content in bio-oil reached a maximum value at 1.0 MPa. The highest conversion of nitrogen (50.25 wt%) into bio-oil was achieved at 1.0 MPa and 800 °C, which was about 7 wt% higher than that at atmospheric pressure. Higher pressures promoted the formation of pyrrolic-N (N-5) and quaternary-N (N-Q) compounds in bio-oil at the expense of nitrile-N and pyridinic-N (N-6) compounds. The X-Ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) results on bio-chars clearly evidenced the transformation of N-5 structures into N-6 and N-Q structures at elevated pressures. The nitrogen transformation pathways during pyrolysis of microalgae were proposed and discussed.
- Subject
- microalgae; nitrogen transformation; pressurized pyrolysis; nitrogen-containing compounds; bio-char
- Identifier
- http://hdl.handle.net/1959.13/1420069
- Identifier
- uon:37537
- Identifier
- ISSN:0960-8524
- Language
- eng
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