Pre-treatments of the viscose rayon based activated carbon fibers(ACFs) with acid(HNO3,H2SO4,HCl),alkali(NaOH) and steam were carried out to modify the surface characters of ACFs.The activities of ACFs for selective catalytic reduction(SCR) at lower temperature were tested.There is an increase in the content of functional group with oxygen on the surface of ACF and a decrease in micropore range for the ACF treated with HNO3.The new functional groups are formed for the ACF treated with H2SO4,HCl and NaOH,which can improve the activity of SCR,and an increase in micropore range for ACF treated with NaOH is found.However,the portion of mesopores increases but the catalytic activity of ACF decreases for the ACF treated with steam.
The selective catalytic reduction(SCR) of NOx using MnOx and CeO2 supported on viscose-based active carbon fibers(ACF) at 120 ℃～270 ℃ relatively lower than the temperature when using V2O5/TiO2-anatase catalyst was studied.As a result,CeO2/ACF shows a better catalysis than MNOx/ACF,which is not affected by the reaction temperature. NO conversion of 85% is reached with the 10%-CeO2/ACF catalyst at the whole temperature window.Furthermore,a series of MnOx-CeO2/ACF composite catalysts were studied.The results show that the loading method of catalyst affects its activity.
