The bio-oils collected after the liquefaction of rice husk contained a complex mixture of hydrocarbons and have been analyzed by GC/MS. The identification of the main compounds was performed using a NIST mass spectral database. Table 3 gives a comparison of the identified compounds in the bio-oils from the liquefaction of rice husk at 573 K, R1 10%, and R2 20% with or without catalyst (NaOH). The total ion chromatograms of bio-oils are presented in Fig. 7. The peak area (%) for each compound identified was defined by percentage of the compound’s chromatographic area out of the total area. Only those compounds with peak area (%) higher than 1% were presented in this table. The percentage values (by
integration from total ion chromatogram) indicate the proportions of individual compounds in the bio-oil but do not present the actual
concentration.