Catalytic pyrolysis of Ulva lactuca macroalgae was studied over Amberlyst-15 catalyst at temperature 400, 500, and 600 oC. The comparison between catalytic non-catalytic in the conversion determined. Intriguingly, it found that improved bio-oil production efficiency. highest yield 29.54 wt% achieved oC with presence an catalyst. Furthermore, could enhance gas by 73.88%. It be attributed due to ...