Temperature-Dependent Effects of SO2 on Selective Catalytic Reduction of NO over Fe鈥揅u鈥揙X/CNTs鈥揟iO2 Catalysts

详细信息    查看全文

• 作者：Zhaoxia Ma ; Hangsheng Yang ; Bo Li ; Fu Liu ; Xiaobin Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：March 13, 2013
• 年：2013
• 卷：52
• 期：10
• 页码：3708-3713
• 全文大小：325K
• 年卷期：v.52,no.10(March 13, 2013)
• ISSN：1520-5045

文摘

Temperature-dependent effects of SO₂ on selective catalytic reduction (SCR) of NO by NH₃ over a TiO₂ and carbon nanotubes (CNTs) supported iron鈥揷opper oxides catalyst were examined. At temperature below 300 掳C, deposition of sulfites and sulfates on the catalyst surface suppressed NH₃ adsorption, NO adsorption, and oxidation, which induced catalyst deactivation. The deposited sulfite/sulfates could be partially removed by 400 掳C postannealing, which regenerated the catalyst. At temperature above 350 掳C, NO adsorption was promoted by SO₂ introduction, and suppression of NH₃ adsorption also minimized the side reaction of NH₃ oxidation, which increased the NO removal efficiency from 68% to 80% through reaction between adsorbed NO and gaseous NH₃.