Investigation of Biomass Direct Reduction of Iron-Based Mineral in the Chemical Looping Hydrogen Production Process

Key Points

• This research aims to evaluate the reduction reactions of iron-based oxygen carriers in chemical looping hydrogen production using biomass.
• Assessed oxidation and reduction reactions of iron-based oxygen carriers in chemical looping processes.
• Investigated direct reduction of oxygen carriers using biomass in a fluidized bed reactor.
• Examined the influence of biomass-to-oxygen carrier ratio and biomass pre-treatment on reduction conversion rates.
• Analyzed the impact of biomass char accumulation on particle fluidization and reaction progress.
• Pre-oxidation treatment improved surface structure and redox reactivity of oxygen carriers.
• Natural iron oxides showed lower reactivity in gas reduction compared to pure iron oxides but demonstrated better resistance to particle agglomeration.
• Direct reduction with biomass confirmed effective reduction reactions in the reactor.
• Maintained fluidization under optimal conditions led to stable hydrogen gas production through steam oxidation of reduced oxygen carriers.