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

• CeO2 facilitated the decomposition of ammonia bisulfate over V-Mo/Ce-Ti catalyst.
• Sulfated ceria formed in the decomposition process of ammonia bisulfate over CeO2.
• S species accumulated for CeO2 in the catalyst and released at high temperatures.
• Activity of V-Mo/Ce-Ti catalyst covered by ABS could be regenerated by annealing.

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.

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