The common SCR catalysts were quality changed by vanadium salt solution and cerium salt solution

and the effect of HCl concentration and temperature on the modified catalyst's mercury oxidation ability was investigated.The results showed that

compared with the general catalyst

the V2O5content in V modified catalyst increased

while the catalyst's specific surface area and pore structure decreased sharply

the mercury oxidation efficiency was lower;a new active matter CeO2appeared in the Ce modified catalyst

the catalyst's specific surface area and pore structure decreased a little

the mercury oxidation ability enhanced;the titanium dioxide in three samples were all anatase titanium dioxide and the active matters were uniformly distributed.The mercury oxidation mechanism was approximate as the Deacon process when HCl existed

and with an increase in temperature

the mercury oxidation efficiency first increased then decreased

the best mercury oxidation temperature were 350 ℃;within temperature range of 200to 400 ℃

the mercury oxidation efficiency increased rapidly with HCl concentration ranging from 0ppm to 60ppm

and tended to be saturated when HCl concentration was above 60ppm.