A series of VO-xCeO/AC (noted as V-Ce/AC) catalysts were synthesized by the impregnation method, which combined the advantage of AC and V-Ce. The effects of SCR atmosphere on Hg removal were systematically investigated at low temperature. The experimental results indicated that NO had a positive effect on Hg removal. In addition, an interesting experimental phenomenon was found that NH also showed a positive effect on Hg removal, which is different from many studies that have reported a negative effect of NH on Hg removal by other catalysts. NH-TPD experiment showed that there was no apparent competition between NH and Hg. An FT-IR gas analyzer and in situ DRIFTS were used to study the mechanism for the effect of NH on the catalyst surface and found that a small part of NH was overoxidized to NO in this catalytic system. O acted as a promoter in the whole process of NO and Hg removal. However, HO showed an inhibiting effect on Hg and NO removal over V-Ce/AC catalysts, which may be caused by the competitive adsorption of HO and pollutants (NO and Hg). Additionally, 1 V-8Ce/AC catalyst exhibited high stability ( E = 87.6%, E = 82.84%) after 72 h reaction in SCR atmosphere at 150 °C.
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