Effect of V2O5 Additive on the SO2 Resistance of a Fe2O3/AC Catalyst for NH3-SCR of NOx at Low Temperatures

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• 作者：Weiwei Yang ; Fudong Liu ; Lijuan Xie ; Zhihua Lian ; Hong He
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：March 16, 2016
• 年：2016
• 卷：55
• 期：10
• 页码：2677-2685
• 全文大小：556K
• ISSN：1520-5045

文摘

The effect of vanadium oxide on an iron-based catalyst supported on activated carbon (AC) in the selective catalytic reduction of NOx by NH₃ (NH₃-SCR) was investigated in this work. A series of vanadium-modified Fe₂O₃/AC catalysts were prepared by a coimpregnation method. The addition of a small amount of vanadium oxide contributed to the higher dispersion of iron species on the surface of the catalyst. Among various vanadium-modified iron catalysts supported on AC, 3% Fe–0.5% V achieved the best SCR activity and SO₂ tolerance. In the presence of H₂O, SO₂ had a severe deactivation effect on both vanadium- and non-vanadium-modified catalysts, yet the inhibition effect of H₂O and SO₂ was reversible on 3% Fe–0.5% V at relatively low space velocity. It was found that the vanadium additive promoted the formation of sulfate species. The formed sulfate species increased the surface acidity and thus enhanced the tolerance toward SO₂.