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

Priharto, N., Ronsse, F., Prins, W., Carleer, R. & Heeres, H. J., Sep-2020, In : Fuel processing technology. 206, 14 p., 106466.

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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 degrees C) with fractional condensation. The heavy phase pyrolysis oils were hydrotreated (350 degrees C and 15 MPa of H-2 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 x 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
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

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