Bio-oil is a condensable liquid produced from the pyrolysis of biomass, which can be upgraded to biofuels. Bio-oil is corrosive as it contains significant amounts of carboxylic acids, creating difficulties in handling of bio-oil and applications of bio-oil. Acid-treatment of bio-oil in alcohols is an upgrading method to transform the carboxylic acids in bio-oil into neutral esters. This study reviewed the recent progress in the research about the acid-catalyzed conversion of bio-oil in alcohols. The various catalytic processes for the acid treatment of bio-oil and the reaction network of some individual components of bio-oil during the upgrading were focused. The interactions among the main components of bio-oil during the acid-treatments were also discussed.
Hu, X., Gunawan, R., Mourant, D., Mahmudul Hasan, M. D., Wu, L., Song, Y., ... Li, C. Z. (2017). Upgrading of bio-oil via acid-catalyzed reactions in alcohols: a mini review. Fuel processing technology, 155, 2-19. https://doi.org/10.1016/j.fuproc.2016.08.020