Gasification is one of the most promising approaches to accomplishing efficient utilization of biomass, nevertheless, it shows severe problems of low efficiency and syngas quality, which deserves further improvements. In this regard, deoxygenation-sorption-enhanced biomass gasification is proposed and experimentally explored using deoxidizer-decarbonizer materials (xCaO-Fe) for intensified hydrogen production. The materials follow the deoxygenated looping of Fe0-3e-↔Fe3+ as an electron donor and the decarbonized looping of CaO + CO2 ↔ CaCO3 as a CO2 sorbent. Specifically, the H2 yield and CO2 concentration reach 7.9 mmol·g-1 biomass and 10.5 vol%, which increases by 311% and decreases by 75%, respectively, compared with conventional gasification, confirming the promotion effect of deoxygenation-sorption enhancement. Fe embedded within the CaO phase is successfully constructed with the formation of functionalized interface structure, affirming the strong interaction between CaO and Fe. This study brings in a new concept for biomass utilization via synergistic deoxygenation and decarbonization, which will substantially boost high-quality renewable hydrogen production.
Keywords: Calcium-based CO(2) looping; Deoxidizer-decarbonizer materials; Deoxygenation-sorption-enhanced gasification; Iron-based redox looping.
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