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Improved catalytic performance and resistance to SO2 over V2O5-WO3/TiO2 catalyst physically mixed with Fe2O3 for low-temperature NH3-SCR
Catalysis Today ( IF 5.3 ) Pub Date : 2020-07-29 , DOI: 10.1016/j.cattod.2020.07.042
Tae Hun Kang , Seunghee Youn , Do Heui Kim

A series of V2O5-WO3/TiO2 catalysts physically mixed with several Fe2O3 samples having different textural properties were prepared and applied to the selective catalytic reduction (SCR) of NOx with NH3. The physically mixed catalysts exhibited higher catalytic stability and SO2 resistance than the V2O5-WO3/TiO2 catalyst in the presence of SO2. The physicochemical properties of V2O5-WO3/TiO2 catalysts physically mixed with Fe2O3 were investigated by various analytical techniques, such as N2 adsorption-desorption, X-ray diffraction (XRD), Raman spectroscopy, temperature-programmed desorption with sulfur dioxide (SO2-TPD) and ammonia (NH3-TPD), and in situ Fourier-transform infrared spectroscopy (FT-IR) measurements. The formation of ammonium sulfate species was observed in the catalysts during the NH3-SCR reactions, leading to deactivation of the catalysts. SO2-TPD analyses revealed that Fe2O3 adjacent to V2O5-WO3/TiO2 suppressed the formation of ammonium sulfate species by generating iron sulfate species. In addition, the in situ FT-IR and NH3-TPD results indicated that the adsorption of SO2 on Fe2O3 could increase NOx conversion due to the additional production of Brønsted acid sites provided by iron sulfate. Among the catalysts tested, the mechanical mixture of V2O5-WO3/TiO2 and Fe2O3, with the highest surface area and pore volume, showed the best NH3-SCR activity and SO2 resistance at low temperature in the presence of SO2.



中文翻译:

与与 Fe 2 O 3物理混合的V 2 O 5 -WO 3 /TiO 2催化剂相比,用于低温 NH 3 -SCR 的催化性能和抗 SO 2性能得到改善

制备了一系列与几种具有不同结构特性的Fe 2 O 3样品物理混合的 V 2 O 5 -WO 3 /TiO 2催化剂,并将其应用于 NO x与 NH 3的选择性催化还原(SCR)。物理混合催化剂具有较高的催化稳定性和SO 2电阻比V 2 ø 5 -WO 3 /的TiO 2催化剂在SO存在2。V 2 O 5 -WO 3 /TiO的理化性质通过N 2吸附-解吸、X射线衍射(XRD)、拉曼光谱、二氧化硫(SO 2 -TPD)和氨程序升温解吸等多种分析技术研究了与Fe 2 O 3物理混合的2种催化剂(NH 3 -TPD) 和原位傅里叶变换红外光谱 (FT-IR) 测量。在NH 3 -SCR反应期间在催化剂中观察到硫酸铵物质的形成,导致催化剂失活。SO 2 -TPD 分析表明,与 V 2 O 5相邻的Fe 2 O 3-WO 3 /TiO 2通过生成硫酸铁物质来抑制硫酸铵物质的形成。此外,原位FT-IR 和 NH 3 -TPD 结果表明 SO 2在 Fe 2 O 3上的吸附可以增加 NO x转化,因为硫酸铁提供了额外的布朗斯台德酸位点。在测试的催化剂中,具有最高表面积和孔体积的 V 2 O 5 -WO 3 /TiO 2和 Fe 2 O 3的机械混合物表现出最好的 NH 3-SCR活性和SO 2在SO的存在下的耐低温性2

更新日期:2020-07-29
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