Effect of pretreatment temperature on the yield and properties of bio-oils obtained from the auger pyrolysis of Douglas fir wood

- Treating biomass below 300 °C does not have a major effect on product yields.
- Guiacyl (G) units decrease when the biomass is heated over 300 °C.
- The yield of levoglucosan reduces when the biomass was heated over 260 °C.
- The yield of water increases in the whole range of temperature studied.