Evaluation of hematite oxygen carrier in chemical-looping combustion of coal

► Hematite oxygen carrier showed a good behavior in coal CLC for CO2 capture. ► N2 was the sole product of fuel-N transfer in the fuel reactor. ► There were neither hydrocarbons heavier than CH4 nor tars in the exit of the fuel reactor. ► A high fuel reactor temperature produced more fuel-N to N2. ► The extent of carbon conversion in the fuel reactor determined the conversion of fuel-N to N2.