Table 2: Experimental scheme for oxygen carriers’ reactivity test.

No. of cyclesInert/reducing gas /
(s)(s)(s)(°C)(°C)

3Nitrogena360900900
3Methane6020950950
3Syngas6080950950
3Nitrogen360900900
1Nitrogen18009001000

The oxygen concentration was measured during the inert periods in order to evaluate the ability of the oxygen carriers’ to release oxygen in the gas phase.