Abstract
Oxygen carrier (OC) used in biomass chemical looping gasification usually requires good activity and selectivity for synthesis gas. In this work, Sr is selected to doped into the A site of brownmillerite oxide Ca2Fe2O5 to enhance the reactivity for synthesis gas production from biomass. This work shows that small content of Sr can be doped into brownmillerite structure, and Sr doping enhanced the activity of Fe cations in the structure. Fixed bed tests show that Sr doping obviously enhances the production of H2 and CO, as well as its selectivity, but syngas production has no significant promotion with large Sr content, and Ca1.4Sr0.6Fe2O5 is selected as the most suitable OC. The multiple cycle test indicates that the synthesis gas production is weakened slightly, and it is mainly attributed to ash deposit, which cause the melting of alkali metal compound and brownmillerite structure destruction by phosphorus-contained compounds.
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