With the declining of crude oil resources, the development of bio-oil from biomass into fast pyrolysis has attracted much attention. However, the bio-oil contains many oxygenic compounds such as phenols, funans, aldehyde, ketone, etc., and its oxygen content is high up to 50%, leading to its low heating value and thermal instability, which hinders its extensive application. It is necessary to remove the oxygen from bio-oil by a hydrodeoxygenation (HDO) process. Among many oxygenic compounds, phenolic hydroxyl oxygen is considered the most difficult one to be removed. The HDO of phenols was reviewed and the effective way for further improving the catalyst activity was proposed.
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