The experiment about gas-phase Hg0adsorption by nano-Fe2O3-SiO2sorbents in simulated flue gas atmosphere was performed on a fixed bed reactor

using an online gas-mercury analyzer.The effect of such factors as Fe2O3loading

bed temperature

residence time

water vapor concentration and SO2on the mercury removal efficiency was investigated.The results showed that

compared with the nano-Fe2O3powders

the nano-Fe2O3/SiO2had better performance for mercury removal.With the increasing Fe2O3loading

bed temperature and water steam concentration

the mercury removal rate increased first and then dropped.The optimal conditions were:at bed temperature of 350℃

with the Fe2O3loading of 10% and the water vapor volume fraction of 3%.Due to the influence of mass transfer on the reaction

prolonging the residence time was good to the mercury removal

but high SO2concentration went ill with the mercury removal

which should be controlled below 1 000μL/L.