Catalytic gasification of oil-extracted residue biomass of Botryococcus braunii

Hideo Watanabe, Dalin Li, Yoshinao Nakagawa, Keiichi Tomishige, Makoto M. Watanabe

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Catalytic gasification of the oil-extracted residue biomass of Botryococcus braunii was demonstrated in a laboratory-scale continuous feeding dual bed reactor. Steam gasification at 1023 K over Ni-Fe/Mg/Al catalyst can completely reform tar derived from pyrolysis of the residue biomass into C1 gases and hydrogen, and has achieved 91%-C conversion to gaseous product (CO + CO2 + CH4). Composition of product gas has higher contents of CO and H2 with their ratio (H2/CO) of around 2.4 which is slightly H2-rich syngas. Maximum hydrogen yield of 74.7 mmol g-biomass-1 obtained in this work is much higher than that from gasification of other algal biomass reported in literature. The residue biomass of B. braunii can be a superior renewable source of syngas or hydrogen.

Original languageEnglish
Pages (from-to)452-459
Number of pages8
JournalBioresource Technology
Publication statusPublished - 2015 Jul 28


  • Algal biomass
  • Botryococcus braunii
  • Ni-Fe catalyst
  • Oil-extracted residue
  • Steam gasification

ASJC Scopus subject areas

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


Dive into the research topics of 'Catalytic gasification of oil-extracted residue biomass of Botryococcus braunii'. Together they form a unique fingerprint.

Cite this