LFO Perovskites as Oxygen Carriers for Chemical Looping Oxygen Uncoupling (CLOU)

Alternative energy technologies at their current state cannot fully replace the existing fossil fuel-based energy production that has led to a rise in the atmospheric CO2 concentration. CO2 sequestration is a compelling solution to greatly reduce CO2 emissions from sources like fossil fuel-based power plants. Chemical-looping oxygen uncoupling process releases gaseous oxygen for combustion at high temperatures in the fuel reactor. The choice of oxygen carrier material (OCM) is pivotal to the chemical-looping process. In this study, citrate gel technique has been used to prepare the OCMs. A total of 5 (five) perovskites were prepared with varying degree of substitution of general formula La0.6A′0.4B′1-yFeyO3 where y = (0.8, 0.9) including the base LaFeO3. Calcined OCMs were characterized with XRD, SEM and BET analysis. OCMs showed an increase in surface area after oxygen release in a thermogravimetric experiment. Oxygen evolution rate ranged from 0.0043 to 0.0521 Kg O2/Kg OCM in a single cycle operation.