Bio-oil is formed in the liquid phase from algal biomass in anaerobic
condition at high temperature. The composition of bio-oil
varies according to different feedstocks and processing conditions,
which is called as pyrolysis (Iliopoulou et al., 2007; Yanqun et al.,
2008). There are several parameters such as water, ash content,
biomass composition, pyrolysis temperature, and vapor residence
time, which affect the bio-oil productivity (Fahmi et al., 2008).
However, due to the presence of water, oxygen content, unsaturated
and phenolic moieties, crude bio-oil cannot be used as fuel.
Therefore, certain treatments are required to improve its quality