The results for the esterification of the pure compound were similar to those for bio-oil as a-terpineol, terpinolene, a-terpinene,p-cymene were detected (Fig. 3). The incomplete conversion of aterpinene in the bio-oil esterification could have been due to inactivation
of the catalyst by the N-containing organics in the leaf biooil and the formation of a-terpinene from other precursors such as the terpenoids.