Abstract
The impact of biochemical composition (cellulose, hemicelluloses, lignin, and suberin) on the products of pyrolysis of lignocellulosic biomass was investigated. A comparative study using double-shot pyrolysis of cork, branches and leaves of cork oak (Quercus suber) was conducted. Differential scanning calorimetry and thermogravimetric analysis (DSC-TGA) demonstrated 350 °C and 550 °C to be the optimal temperatures for the two shots. Leaves and branches released mainly polysaccharide derivatives in the first shot and produced phenols in the second shot, while cork mainly released ketones in the first shot and produced aliphatic hydrocarbons in the second shot. Higher selectivities in high added-value chemicals, such as benzofurans (20.3 %) and ketones (26.5 %) were respectively achieved for leaves and branches at 350 °C whereas aliphatic hydrocarbons (48.8 %) were mainly obtained from cork at 550 °C.
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