Experimental studies on a two-step fast pyrolysis-catalytic hydrotreatment process for hydrocarbons from microalgae (Nannochloropsis gaditana and Scenedesmus almeriensis)

Neil Priharto, Frederik Ronsse, Wolter Prins, Robert Carleer, Hero Jan Heeres*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
16 Downloads (Pure)

Abstract

Two microalgae species (marine Nannochloropsis gaditana, and freshwater Scenedesmus almeriensis) were subjected to pyrolysis followed by a catalytic hydrotreatment of the liquid products with the objective to obtain liquid products enriched in hydrocarbons. Pre-dried microalgae were pyrolyzed in a mechanically stirred fluidized bed reactor (380 and 480 °C) with fractional condensation. The heavy phase pyrolysis oils were hydrotreated (350 °C and 15 MPa of H2 pressure for 4 h) using a NiMo on alumina catalyst. The pyrolysis liquids after pyrolysis and those after catalytic hydrotreatment were analyzed in detail using GC–MS, GC × GC–MS, and 2D HSQC NMR. The liquid products are enriched in aromatics and aliphatic hydrocarbons and, as such have a considerably lower oxygen content (1.6–4.2% w/w) compared to the microalgae feeds (25–30% w/w). The overall carbon yield for the liquid products was between 15.6 and 19.1% w/w based on the initial carbon content of the algae feedstock.

Original languageEnglish
Article number106466
Number of pages14
JournalFuel processing technology
Volume206
DOIs
Publication statusPublished - Sep-2020

Keywords

  • Microalgae
  • Fast pyrolysis
  • Catalytic hydrotreatment
  • Deoxygenation
  • Hydrotreated oils
  • BIO-OIL PRODUCTION
  • HYDROTHERMAL LIQUEFACTION
  • INTERMEDIATE PYROLYSIS
  • BED REACTOR
  • BIOMASS
  • HYDRODEOXYGENATION
  • PRODUCTS
  • YIELD
  • IDENTIFICATION
  • PRETREATMENT

Cite this