Hydrogen Conversion by Microalgae Through Water Gasification under Different Operating Conditions, and Fe2O3, Al2O3, and CaO Additives: an Experimental Study

Microalgae are a promising feedstock for sustainable Hydrogen Production, leveraging their photosynthetic capabilities to convert sunlight and carbon dioxide into hydrogen gas. Microalgae grows quickly, yields high biomass per unit area, and grows in diverse environments. Microalgae cultivation for hydrogen production through SCWG is examined in this study, including resident times, gasification temperatures, and nano additives effects in hydrogen production. Residence times ranged from 30 to 60 min and temperatures from 300 to 480 °C, with 5 min and 30 °C increments respectively. Nano additives and hybrid nano additives like Fe2O3, Fe2O3/Al2O3, Fe2O3/CaO, and Fe2O3/Al2O3/CaO improved hydrogen conversion efficiency. Conversion efficiency is higher (82.4%) with Fe2O3/Al2O3/CaO at longer resident time (60 min) and at higher reaction temperature (480 °C). Thus, hybrid nano-additives Fe2O3/Al2O3/CaO outperformed. These findings help to optimize microalgae gasification processes for hydrogen production and renewable energy generation, advancing sustainable energy and waste management technologies.