Effect of Zr Addition on the Low-Temperature SCR Activity and SO2 Tolerance of Fe鈥揗n/Ti Catalysts

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• 作者：Boqiong Jiang ; Boyang Deng ; Zhanquan Zhang ; Zuliang Wu ; Xiujuan Tang ; Shuiliang Yao ; Hao Lu
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 10, 2014
• 年：2014
• 卷：118
• 期：27
• 页码：14866-14875
• 全文大小：556K
• ISSN：1932-7455

文摘

Zr is added to the Fe鈥揗n/Ti catalyst to increase NO conversion and improve SO₂ tolerance. It is found that 0.03 is the optimal ratio for Zr/(Ti + Zr). With this ratio, the NO conversion below 150 掳C increases, and the SO₂ poisoning is alleviated, while the further increase of Zr does not have a positive effect on NO conversion and SO₂ tolerance. With Zr additive, more manganese oxides are reduced in the form of MnO₂ and Mn₂O₃ at lower temperature in H₂-TPR, and the total amount of H₂ consumption rises, indicating better redox properties. It leads to the increase of NO complexes on the catalysts. Despite the small decrease of NH₃ adsorption, the reaction via the L鈥揌 way is promoted and NO conversion increases. Furthermore, more nitrates and NO₂ are formed in the reaction with SO₂ on Fe鈥揗n/Ti鈥揨r(0.03) compared to Fe鈥揗n/Ti, so the L鈥揌 reaction way is less inhibited by SO₂ with Zr additive, and the SO₂ tolerance of this catalyst is also improved.