Promotion of ceria for decomposition of ammonia bisulfate over V₂O₅-MoO₃/TiO₂ catalyst for selective catalytic reduction

Ammonia bisulfate (ABS) that usually generates on the surface of SCR catalysts has strong negative effect on selective catalytic reduction (SCR) process at low temperatures (<220 °C, dew-point temperature of ABS). In this work, the decomposition of ABS over CeO₂ and V₂O₅-MoO₃/CeO₂-TiO₂ catalyst was investigated in detail via TG-MS analysis. The results showed that CeO₂ could facilitate the decomposition of ABS over the V₂O₅-MoO₃/CeO₂-TiO₂ catalyst, on which cerium sulfate species formed by the interaction of CeO₂ and ABS.