Paper Infomation
Effect of V2O5 Supported on the Sulfated TiO2 for Low-temperature SCR of NO by NH3
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Author: Ludi Zhang, Jian Li, Hong He, Wenjun Liang, Quanming Liang
Abstract: V2O5-WO3/TiO2-SO42- catalysts were prepared by wet impregnation method with sulfated nano-TiO2. Different acid amounts, activities, sulfur tolerance and regeneration of the catalysts were tested. It was found that the low-temperature catalytic activity of V2O5-WO3/TiO2-SO42- was improved after modified with 0.4M H2SO4. BET and XRD results showed that the specific surface area of catalysts decreased after sulfating without crystal form changing. The catalytic activity of V2O5-WO3/TiO2-SO42- catalyst was better than the original, which decreased from 95% to 90% in 50h under the condition of 300ppm SO2 at temperature of 180℃. FT-IR and TG results showed that the deactivation by SO2 was due to the ammonium sulfate forming during the SCR reaction. The activity of poisoned catalysts could be recovered to the fresh level after calcined at 490℃.
Keywords: Acidification; SCR; Sulfur Tolerance; Regeneration
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