The efficiency of the metal oxide-doped dolomite (MO/CMD900) catalysts was assessed in terms of bio-oil yield and quality. In the precipitation technique [24], [25], 10 wt% of nickel-metal was dissolved in 10 mL of deionised water and CMD900 was mixed with 100 mL of deionised water at 60 °C. The nickel-metal aqueous solutions were then applied ...