Chemical-looping combustion(CLC)is a promising technology with inherent separation of CO2.Because coal is cheaper and more abundant than gaseous fuel

it is attractive to adapt CLC for use with coal.The gasification process of coal is the limiting step

so this study presented an enhancement of gasification rate of coal using Na-loaded iron ore as oxygen carrier in a 1 kWth continuous reactor.The effect of fuel reactor temperature on the chemical-looping combustion of coal was investigated.The results showed that the catalytic effect of Na on coal gasification was obvious in the fuel reactor temperature range of 820-920℃.There was an obvious increase in the concentration of CO2 from fuel reactor and a decrease in the concentration of CO with the increase of fuel reactor temperature.The CO2 capture efficiency and carbon capture efficiency for Na-loaded iron ore were 78.60% and 80.54% respectively

whereas those for iron ore were 40.27% and 45.65%.The Na-loaded iron ore showed sintering and agglomeration on the oxygen carrier particles and the defluidization phenomena of the fuel reactor was observed at a fuel reactor temperature of 950℃.This was likely due to the low melting point of the sodium compounds and the over-reduction of the oxygen carrier.SEM and XRD analysis showed that the reduction degree of Fe2O3 in the oxygen carrier using Na-loaded iron ore was intensively enhanced.