Fast pyrolysis of different kinds of lignocellulosic biomasses
usually produce bio-oil yields in the 60–80 wt.% range, a gas yield
of 5–25 wt.% and a char yield in the 15–35 wt.% range, depending
on the amount of ash in the raw material . Generally, the
main objective in the fast pyrolysis is obtaining the highest biooil
yield, whilst the gas can be used to satisfy the energy requirements
of the pyrolysis process itself . The char or solid residue
can also be used as fuel to provide heat to the process or as raw
material for producing activated carbons with high adsorption
capacity to remove toxic gas streams and treat polluted liquid
effluents . Moreover, porous carbon materials also play a
significant role in new applications, such as catalytic supports, battery
electrodes, capacitors and gas storage .