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Microwave pyrolysis of Laminaria digitata to produce unique seaweed-derived bio-oils

Kostas, ET; Williams, OSA; Duran-Jimenez, G; Tapper, AJ; Cooper, M; Meehan, R; Robinson, JP; (2019) Microwave pyrolysis of Laminaria digitata to produce unique seaweed-derived bio-oils. Biomass and Bioenergy , 125 pp. 41-49. 10.1016/j.biombioe.2019.04.006. Green open access

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Abstract

Microwave pyrolysis has become an attractive form of processing technology to generate bio-oil, bio-char and syngas from different biomass feedstocks. In this study, microwave pyrolysis was performed on the UK native seaweed Laminaria digitata and its extract residue from a bio-refinery process. Pyrolysis of these two feedstocks was successfully achieved without the requirement of microwave susceptors, as pelletizing the biomass was sufficient to allow microwave pyrolysis to occur. It was found that average energy requirements as low as 1.84–2.83 kJ g−1 were required to pyrolyse 55–70% of both feedstocks and bio-oil yields of 5–8% and 10–14% for native and extraction residue L. digitata were produced, respectively. Maximum microwave pyrolysis processing times were in the order of 200 s. The bio-oil generated from both feedstocks contained no phenolic based compounds, but a greater number of nitrogen-containing compounds and compounds derived from macroalgal polysaccharides. Yields of certain compounds differed in bio-oils generated from the two L. digitata feedstocks, however it was observed that specific energy did not have a direct influence on bio-oil compound yield. Furthermore, the identification of a particular nitrogen-containing compound L-Proline, 1-methyl-5-oxo-, methylester is thought to be a unique product of microwave pyrolysis when carbon-based additives are avoided.

Type: Article
Title: Microwave pyrolysis of Laminaria digitata to produce unique seaweed-derived bio-oils
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.biombioe.2019.04.006
Publisher version: https://doi.org/10.1016/j.biombioe.2019.04.006
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Macroalgae, Laminaria digitata, Microwave Pyrolysis, Bio-oil, Bioenergy
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10072947
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