Influence of the regeneration conditions on the performances and the microstructure modifications of NiO/NiAl2O4 for chemical looping combustion

Specific surface area of the oxygen carrier decreases as cycles number increases from 9.4 m2/g for the fresh material to 4.4 and 2.3 m2/g after thirty cycles at 750 °C and 900 °C respectively. The same trend is observed for porous volume. However, the decrease is lower when particles are regenerated under low oxygen concentration (6 m2/g).