Abstract
Chemical looping gasification (CLG) of Chlorella vulgaris was investigated by TGA and FTIR technology. The release characteristic and evolution behavior of gaseous products and bio-char in different conditions were analyzed to evaluate the effects of CLG and microwave pretreatment. The results indicated that the gas production of CLG was higher than that of SiO2:Chlorella, and it would be higher after microwave pretreatment. CO, CO2, and CH4 were mainly produced in the pyrolysis and gasification stages. After adding Fe2O3, C―O, C═O, and C═C compounds decreased by 3.75%, 20.86%, and 24.72%, respectively. But more CO, CO2, and CH4 were produced. Microwave pretreatment was helpful for reducing the degrees of hydrogen-rich, aliphatic structure, aromatization, and oxygen-rich in char. Moreover, microwave pretreatment promoted the reduction of C―O, C═O, and C═C compounds. However, CO increased by 55.63%, and CO2 decreased by 2.31% in this condition. Therefore, microwave pretreatment was beneficial to CLG reaction.
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