The conversion of oxygen for Fe2O3/Al2O3 oxygen carriers was around 10% for 4 minutes of reduction that corresponded to the amount of oxygen utilization from Fe2O3 to Fe3O4.
FeO and FeAl2O4
were formed at the end of first stage, indicating that Fe3O4
was further reduced to FeO, and part of FeO reacted with
Al2O3 to form FeAl2O4. The formation of FeAl2O4 was
corresponded to the previous research reported by Ishida et
al. (2005) using Al2O3 supported Fe2O3 in the reduction
process