After run for 14 400

25 144and 30 288hours

the denitration efficiency of a commercial SCR catalyst decreased significantly

respectively.Moreover

the one with the shortest operation time had the poorest performance.Thus

the sulfuric acid and ammonia chloride was used to regenerate the catalyst

and such tests as the BET specific surface area

XRD

SEM and EDX were applied to characterize it before and after the regeneration.The results show that

both the H2SO4and NH4Cl had good regeneration effect

and the latter had better one.The denitration efficiency of the regenerated catalyst can reach up to 90%in the lab simulation condition.The active components on surface of the regenerated catalyst had no change and was affected less by space velocity.Due to high temperature

the catalyst with operation time of 14 400hours was deactivated:the nanoparticles on the catalyst surface were seriously sintered and the pore structure was destroyed badly

resulting in nearly no effective recovery by regeneration.