Comparative study on catalytic and non-catalytic pyrolysis of olive mill solid wastes

Elias A. Christoforou, Paris A. Fokaides*, Scott W. Banks, Daniel Nowakowski, Anthony V. Bridgwater, Stelios Stefanidis, Kostas G. Kalogiannis, Eleni F. Iliopoulou, Angelos A. Lappas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this study, catalytic and non-catalytic fast pyrolysis of dried olive husk and olive kernels was carried out. A bubbling fluidised bed reactor was used for the non-catalytic processing of the solid olive wastes. In-situ catalytic upgrading of biomass fast pyrolysis vapours was performed in a fixed bed bench-scale reactor at 500 °C, for catalyst screening purposes. A maximum bio-oil yield of 47.35 wt.% (on dry biomass) was obtained from non-catalytic fast pyrolysis at a reaction temperature of 450 °C, while the bio-oil yield was decreased at 37.14 wt.% when the temperature was increased to 500 °C. In the case of the fixed bed unit tests, the highest liquid (52.66 wt.%) and organics (30.99 wt.%) yield was achieved with the use of the non-catalytic silica sand. Depending on the catalytic material, the liquid yield ranged from 47.03 to 43.96 wt.% the organic yield from 21.15 to 16.34 wt.% on dry biomass. Solid products were increased from 28.23 wt.% for the non-catalytic run to 32.81 wt.% on dry biomass, when MgO (5% Co) was used.

Original languageEnglish
Pages (from-to)301–313
Number of pages12
JournalWaste and Biomass Valorization
Early online date20 Jan 2017
Publication statusPublished - Feb 2018

Bibliographical note

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  • bio-oil
  • catalytic pyrolysis
  • fast pyrolysis
  • olive
  • olive husk
  • olive kernel


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