It is clearly seen that phenolic compounds (18%) are the major compounds identified in the bio-oil obtained from the liquefaction of rice husk without catalyst, followed by esters (15%), long-chain alkanes (11%), benzene ramifications (3.2%) and furan derivatives concentration. (2.7%). In the case of using NaOH as catalyst, the main components
of bio-oil are long-chain alkanes (30%); and the contents of phenolic compounds (9.7%), esters (8.5%) and naphthalene derivatives (7.1%) were the next. A conclusion may be made that the formation of alkanes was enhanced by the NaOH catalyst, e.g., the relative concentration of long-chain alkanes in the bio-oil was 11% without catalyst, while it increased dramatically to 30% in the presence of NaOH.