Pyrolysis, combustion and gasification characteristics of Nannochloropsis gaditana microalgae

► Pyrolysis, combustion and gasification of marine biomass were evaluated. ► Oxygen concentration enhanced the oxidation stage of the NG microalgae. ► N-compounds were evolved in pyrolysis. Sulfur compounds are evolved in combustion. ► Combustion and pyrolysis main gas products evolved during the second step. ► H2 production during gasification was enhanced by steam concentration.