Deoxygenation of fatty acids is a broad term that covers HDO, decarboxylation, decarbonylation, or even cracking. Temperature of the process is close to 300°C or higher. Therefore, independently on deoxygenating catalyst selection, the fol­lowing reactions could occur:

• HDO (hydrotreating)

• Decarboxylation

• Decarbonylation

• Hydrogenation of double bond in unsaturated fatty acids

• Cracking

In this case selectivity toward desired reaction mechanism should be division criteria, which is important to understand different approaches for deoxygenation, there straight and weaknesses.