Microwave-enhanced pyrolysis of macroalgae and microalgae for syngas production

Yu Hong, Wanru Chen, Xiang Luo, Chengheng Pang, Edward Lester, Tao Wu

Research output: Journal PublicationArticlepeer-review

80 Citations (Scopus)

Abstract

In this study, three different marine biomasses, i.e., microalgae-spirulina, chlorella and macroalgae-porphyra, were pyrolyzed in a laboratory-scale multimode-microwave cavity at 400, 550 and 700 °C. Ovalbumin and cellulose were also chosen as model compounds to simulate algae. The influence of heating rate on pyrolysis and the βi curves of different samples under different temperatures were studied in detail. The porphyra was found to be the most reactive and produced the largest gaseous fraction (87.1 wt%) amongst the three algae, which comprised of 73.3 vol% of syngas. It was found that nitrogenated compounds in bio-oil were derived from protein in algae while carbohydrate led to the formation of PAHs. For the production of bio-oil, protein-rich microalgae is favorable compared with porphyra due to their lower amount of PAHs, while porphyra is more suitable for the production of H2 + CO rich gas product, which is comparable with that of conventional gasification processes.

Original languageEnglish
Pages (from-to)47-56
Number of pages10
JournalBioresource Technology
Volume237
DOIs
Publication statusPublished - 2017

Keywords

  • Bio-oil
  • Macroalgae
  • Microalgae
  • Microwave-enhanced pyrolysis
  • Syngas

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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