Canadian Forest Service Publications
Bio-oil from pyrolysis of wood pellets using a microwave multimode oven and different microwave absorbers. 2015. Undri, A.; Abou-Zaid, M.; Briens, C.; Berruti, F.; Rosi, L.; Bartoli, M.; Frediani, M.; Frediani, P. Fuel 153:464-482.
Issued by: Great Lakes Forestry Centre
Catalog ID: 36510
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Wood pellets were pyrolyzed using a microwave oven and different microwave power apparatus set-up and absorbers (none. Fe, and carbon). Pyrolysis was realized in a short time in the presence of Feor carbon while it was incomplete if the absorber was not present. Furthermore when the absorber was present the shape of the pellets remained unaltered while if the absorber was not employed pellets were disaggregated. Three fractions were collected from each pyrolysis:a gas. a liquid also called bio-oil and a solid called bio-char. The bio-oil contained two phases and they were quantitatively characterized through a GC/MSFID procedure using an internal standard according to a previously reported method. HPLC/MS. FTIR and 'H NMR spectroscopy were also employed for characterization of these liquids. Cellulose pyrolysis products were present in the upper phase such as water, acetic acid, furans (such as furfural), carbohydrates and their derivatives. Compounds from pyrolysis of lignin such as phenols and veratric acid were present in the bottom phase. The microwave assisted pyrolysis showed the possibility to efficiently convert wood pellets in different products. The main economical important components maybe separated and used as chemicals, natural drugs or pesticides, while the remaining components, the solid and the gas may be used for energy pro duction (solid and bio-oil). Solid may be also used for carbon sequestration.
Plain Language Summary
We tested microwave pyrolysis of wood pellets using various microwave powers and two types of absorbers (iron and carbon). We found that absorbers were essential for complete pyrolysis and to keep the shape of the pellets intact. We collected a gas, a liquid bio-oil and a solid “bio-char”. Our results show the potential of microwave assisted pyrolysis for efficient conversion of wood pellets into various products. Using this technique, the economically important components could be separated and used as chemicals, natural drugs or pesticides. The remaining components, the solid and the gas could be used for energy production. The bio-char may also have carbon sequestration potential.