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Catalytic gasification of algal biomass for hydrogen-rich gas production: Parametric optimization via central composite design

Raheem, Abdul, Ji, Guozhao, Memon, Asif, Sivasangar, Siva, Wang, Wei, Zhao, Ming, Taufiq-Yap, Yun Hin.
Energy conversion and management 2018 v.158 pp. 235-245
algae, biomass, carbon dioxide, carbon monoxide, catalysts, gasification, hydrogen, hydrogen production, methane, models, temperature
This study presents the optimization of algal biomass catalytic gasification for hydrogen-rich gas production. Three operating parameters under varying conditions of temperature (700–900 °C), catalyst loading (5–20 wt%) and reaction time (15–40 min) were optimized. The central composite design (CCD) was used to perform optimization and to investigate the influence of operating parameters on response variables (fractions of H2, CO, CO2 and CH4). The results indicated the temperature and catalyst loading as the most significant reaction parameters influencing H2 production and reducing the tar produced during the gasification process. The highest H2 fraction of 48.95 mol% (18.77 mol kg-biomass−1) was obtained at an optimum condition at 851 °C with catalyst loading of 16.4 wt% and reaction time of 28.8 min. The high R2 values of 0.98, 0.97, 0.95, and 0.90 corresponding to the response variables (H2, CO, CO2 and CH4) showed paramount estimation of model.