Biomass-derived chemical looping gasification is a novel technology to convert biomass into renewable hydrogen-enriched syngas. In this study, the looping materials of Fe₂O₃, CaO, mechanically mixed CaO and Fe₂O₃, and chemically synthesized Ca₂Fe₂O₅ were tested for comparison of the performance and gas evolution processes. The reaction mechanism was illustrated to have an insight into the Fe₂O₃/CaO-based chemical looping process. After that, the chemically synthesized bimetallic Fe-Ca oxides were used as oxygen carriers to promote the hydrogen production from the chemical looping gasification of biomass. Results showed that the mechanically mixed CaO and Fe₂O₃ could be used for the autothermal chemical looping conversion of biomass to produce hydrogen-enriched syngas, while the good hydrogen selectivity of chemically synthesized Ca₂Fe₂O₅ made it a suitable candidate of oxygen carrier, but the cyclic durability should be enhanced to enable a better application for chemical looping gasification conversion of biomass.

Biomass; Chemical looping gasification; Oxygen carrier; Hydrogen-enriched syngas