Chemical looping gasification (CLG) for biomass is an effective way of biomass utilization. The key to this technique is the preparation of high-quality oxygen carriers. In the present work, CaO/LaNi0.5Fe0.5O3 oxygen carriers (OCs) are synthesized and their physicochemical properties of the fresh and used OCs are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and temperature-programmed reduction (TPR). The CLG experiments of algae are implemented. The cyclic redox behaviors are explored to assess the stability of oxygen carriers. The results suggest that LaNi0.5Fe0.5O3 OCs prepared with calcium oxide added can offer a significant performance boost in terms of improving the quality of syngas, which promote the H2 concentration and yield in the syngas. The maximum syngas yield is observed at 850 °C, a water injection rate of 0.3 mL/min, and the CaO/LaNi0.5Fe0.5O3 and biomass mass ratio of 0.5. Meanwhile, the most exciting carbon conversion as well as the highest gasification efficiency occur at this condition. CaO/LaNi0.5Fe0.5O3 still maintains the desirable reactivity for producing syngas with reliable carbon conversion and stable gasification efficiency during 10 redox cycles, indicating that CaO/LaNi0.5Fe0.5O3 is a promising functional oxygen carrier with excellent stability for biomass chemical looping gasification (BCLG).
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