Stabilization of biomass-derived pyrolysis oils

R. H. Venderbosch, A. R. Ardiyanti, J. Wildschut, A. Oasmaa, H. J. Heeres

    Research output: Contribution to journalArticleScientificpeer-review

    317 Citations (Scopus)

    Abstract

    BACKGROUND: Biomass is the only renewable feedstock containing carbon, and therefore the only alternative to fossil-derived crude oil derivatives. However, themain problems concerning the application of biomass for biofuels and bio-based chemicals are related to transport and handling, the limited scale of the conversion process and the competition with the food industry. To overcome such problems, an integral processing route for the conversion of (non-feed) biomass (residues) to transportation fuels is proposed. It includes a pretreatment process by fast pyrolysis, followed by upgrading to produce a crude-oil-like product, and finally co-refining in traditional refineries. RESULTS: This paper contributes to the understanding of pyrolysis oil upgrading. The processes include a thermal treatment step and/or direct hydroprocessing. At temperatures up to 250 °C (in the presence of H2 and catalyst) parallel reactions take place including re-polymerization (water production), decarboxylation (limited CO2 production) and hydrotreating. Water is produced in small quantities (approx. 10% extra), likely caused by repolymerization. This repolymerization takes place faster (order of minutes) than the hydrotreating reactions (order of tens ofminutes, hours). CONCLUSIONS: In hydroprocessing of bio-oils, a pathway is followed by which pyrolysis oils are further polymerized if H2 and/or catalyst is absent, eventually to char components, or, with H2/catalyst, to stabilized components that can be further upgraded. Results of the experiments suggest that specifically the cellulose-derived fraction of the oil needs to be transformed first, preferably into alcohols in a 'mild hydrogenation' step. This subsequently allows further dehydration and hydrogenation.

    Original languageEnglish
    Pages (from-to)674-686
    Number of pages13
    JournalJournal of Chemical Technology and Biotechnology
    Volume85
    Issue number5
    DOIs
    Publication statusPublished - 1 May 2010
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Biofuel
    • Biomass
    • Co-refining
    • Pyrolysis
    • Repolymerization

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