Low-Temperature Selective Catalytic Reduction of NO with NH3 over Mn2O3-Doped Fe2O3 Hexagonal Microsheets

详细信息    查看全文

• 作者：Yi Li ; Yuan Wan ; Yanping Li ; Sihui Zhan ; Qingxin Guan ; Yang Tian
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：8
• 期：8
• 页码：5224-5233
• 全文大小：718K
• ISSN：1944-8252

文摘

Mn₂O₃-doped Fe₂O₃ hexagonal microsheets were prepared for the low-temperature selective catalytic reduction (SCR) of NO with NH₃. These hexagonal microsheets were characterized by SEM, TEM, XRD, BET, XPS, NH₃-TPD, H₂-TPR, and in situ DRIFT and were shown to exhibit a considerable uniform hexagonal microsheet structure and excellent low temperature SCR efficiency. When doped with different Mn molar ratios, Mn₂O₃ was detected in the Fe₂O₃ hexagonal microsheets based on the XRD results without the presence of other MnO_X species. In addition, the hexagonal microsheets with a Mn/Fe molar ratio of 0.2 showed the best SCR removal performance among the materials, where a 98% NO conversion ratio at 200 °C at a space velocity of 30 000 h^–1 was obtained. Meanwhile, excellent tolerances to H₂O and SO₂, as well as high thermal stability, were obtained in Mn₂O₃-doped Fe₂O₃ hexagonal microsheets. Moreover, on the basis of the XPS and in situ DRIFT results, it can be suggested that coupled Mn₂O₃ nanocrystals played a key role at low temperatures and produced a possible redox reaction mechanism in the SCR process.