Results of the IEA round robin on viscosity and stability of fast pyrolysis bio-oils

Douglas C. Elliott, Anja Oasmaa, Fernando Preto, Dietrich Meier, Anthony V. Bridgwater

Research output: Contribution to journalArticlepeer-review


An international round robin study of the stability of fast pyrolysis bio-oil was undertaken. Fifteen laboratories in five different countries contributed. Two bio-oil samples were distributed to the laboratories for stability testing and further analysis. The stability test was defined in a method provided with the bio-oil samples. Viscosity measurement was a key input. The change in viscosity of a sealed sample of bio-oil held for 24 h at 80 °C was the defining element of stability. Subsequent analyses included ultimate analysis, density, moisture, ash, filterable solids, and TAN/pH determination, and gel permeation chromatography. The results showed that kinematic viscosity measurement was more generally conducted and more reproducibly performed versus dynamic viscosity measurement. The variation in the results of the stability test was great and a number of reasons for the variation were identified. The subsequent analyses proved to be at the level of reproducibility, as found in earlier round robins on bio-oil analysis. Clearly, the analyses were more straightforward and reproducible with a bio-oil sample low in filterable solids (0.2%), compared to one with a higher (2%) solids loading. These results can be helpful in setting standards for use of bio-oil, which is just coming into the marketplace.
Original languageEnglish
Pages (from-to)3769-3776
Number of pages8
JournalEnergy and Fuels
Issue number6
Early online date15 May 2012
Publication statusPublished - 21 Jun 2012


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