Catalytic pyrolysis of natural algae over Mg-Al layered double oxides/ZSM-5 (MgAl-LDO/ZSM-5) for producing bio-oil with low nitrogen content

Bioresour Technol. 2017 Feb:225:293-298. doi: 10.1016/j.biortech.2016.11.077. Epub 2016 Nov 22.

Abstract

Cyanobacteria were catalytically pyrolyzed over Mg-Al layered double oxide/ZSM-5 composites (MgAl-LDO/ZSM-5) to produce bio-oil. MgAl-LDO/ZSM-5 with a Mg/Al molar ratio of four was proved to be the best catalyst. Under the optima condition that the final temperature was 823K, heating rate was 10K/min and catalyst/algae mass ratio was 0.75, a maximum yield of liquid (41.1%) was achieved at 823K with a heating rate of 10K/min and a catalyst/algae mass ratio of 0.75, which was much higher than the one obtained without catalyst. The element analysis results proved that this bio-oil had much lower O/C molar ratio and higher HHV. The GC-MS results showed that the bio-oil had less nitrogenous compounds. MgAl4-LDO/ZSM-5 was proved to be an applicable and effective catalyst to obtain bio-oil from catalytic pyrolysis of water-blooming algae.

Keywords: Algae; Catalytic pyrolysis; Deoxygenation; LDO/ZSM-5 composites.

MeSH terms

  • Aluminum Oxide / chemistry*
  • Biofuels*
  • Catalysis
  • Cyanobacteria* / chemistry
  • Cyanobacteria* / metabolism
  • Magnesium Oxide / chemistry*
  • Nitrogen* / analysis
  • Nitrogen* / metabolism
  • Temperature

Substances

  • Biofuels
  • Magnesium Oxide
  • Aluminum Oxide
  • Nitrogen