Co-pyrolysis of palm shell and polystyrene waste mixtures to synthesis liquid fuel

► The pyrolysis of palm shell mixed with polystyrene was performed. ► The maximum of pyrolytic liquid obtained was 68.3 wt% at an optimum process condition. ► The polynomial model fits well to predict the response with high determination coefficients of R2 (0.972) and Q2 (0.610). ► The HHV and composition of the pyrolytic liquid were very close to those of conventional fuel oil.