Catalytic deoxygenation by H2-free single-step conversion of free fatty acid feedstock over a Co-Ag carbon-based catalyst for green diesel production

•Co(10wt.%)-Ag(10wt.%) /AC catalyst exhibited great performance in the deoxygenation of palm fatty acid distillate (PFAD).•The obtained hydrocarbons yield was 92 %, with 95 % selectivity of (C15-C17) diesel range.•The strong Bronsted acid-base sites stimulated the deoxygenation and hydrogenation reactions.•Catalyst was successfully reused in deoxygenation reaction for 8 consequent cycles with minimum coke formation.