Activating Fe2O3 using K2CO3-containing ethanol solution for corn stalk chemical looping gasification to produce hydrogen

Abstract

Alkaline organic liquid waste was introduced to activate Fe2O3 and provide sufficient steam to boost biomass chemical looping gasification (CLG) for H2 production. Experiments under different excess oxygen ratios, temperatures, and alkali contents were performed to investigate the reaction characteristics of alkaline organic waste - biomass CLG. The highest H2 yield of 1.71 L and carbon conversion rate of 83.8% were obtained at the excess oxygen ratio of 0.2, the alkali concentration of 6%, and the reaction temperature of 800 °C. Moreover, the kinetic and thermodynamic analysis under the optimized condition have cast light on the fundamental understanding of alkaline organic liquid waste - biomass CLG. Results demonstrate that this novel approach has the potential to enhance energy conversion.