Abstract

Chemical looping pyrolysis (CLPy) provides a novel strategy for biomass conversion by gaining upgraded bio-oils and clean syngas separately. The distribution of gas-liquid-solid products during Chlorella CLPy with reduced Ca2Fe2O5 oxygen carrier (Re-CF) was investigated by using a fixed bed reactor. The results showed that compared with direct pyrolysis of Chlorella, CLPy significantly enhanced the hydrocarbon content and reduced the oxygen content of the bio-oils. The oxygen element migrates via two pathways: bulk ketonization of CaO and surface ketonization of metal oxides to ketones and hydrodeoxygenation (HDO) reactions of ketones, aldehydes, and carboxylic acids to alcohols. In the pyrolysis stage, the gas phase products were dominated by CO2 and H2, while the Re-CF was converted to Ca2Fe2O5 and CaCO3. In the gasification stage, CO-rich syngas was generated via the reactions between oxygen carrier and pyrolysis char. Furthermore, the oxygen carrier was reduced to its reduction state and the regeneration of the oxygen carrier was realized.

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