“…Of all the products of biomass conversion, bio-oil from pyrolysis and liquefaction of biomass has received considerable attentions since it could replace fossil fuels or could be used as feedstock for many chemicals production (Cordella et al, 2012;Jacobson et al, 2013;Kanaujia et al, 2014;Li and Suzuki, 2010). The assessment of the potential of bio-oil has been done by many scientists and some strategies and policies have also been proposed for replacing fossil fuel with bio-oil (Demirbas, 2011;Wonglimpiyarat, 2010 Despite its potential, bio-oil contains various unwanted oxygenated compounds such as acids and aldehydes/ketones which should be removed since their existence could result in the thermal instability of the fuel (Lehto et al, 2014;Oasmaa and Kuoppala, 2003) and mismatching with the standard fossil fuel properties. In order to upgrade the quality of bio-oil, some approaches, such as hydroprocessing/hydrotreatment and catalytic cracking have been investigated and applied.…”