from the LSF731 which was obtained from the first redox cycle in
the TGA, equal to 6.1 wt.%.
The normalised solids conversion and reaction rate for LSF731
appear high during reduction. The slope of the LSF731 can be
deceptive, however, as significantly less oxygen is available due
to the beta coefficient associated with the perovskite. The iron
oxide, on the other hand, has very high oxygen availability yet
the normalised solids conversion appears much lower. This is
due the slow kinetics of iron oxide reduction.
The average normalised solids conversion at any time shown in
Fig. 5, was modelled as the addition of the individual normalised
solid conversion of LSF731 and iron oxide multiplied by the respective
weight fraction of available oxygen in the OCM coming from
the iron oxide, cFe2O3, or the LSF731, cLSF731.