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采用羟基铁离子柱撑钠化海泡石改性后,以浸渍法制备了铜负载铁柱撑钠化海泡石Cu/Fe-NaPILCS催化剂,作为比较以浸渍法制备了铁负载钠化海泡石(Fe-NaSep),铜负载钠化海泡石(Cu-NaSep)和铜铁负载钠化海泡石(Cu/Fe-NaSep)催化剂.并将它们应用于C3H6选择性催化还原NO的反应(C3H6-SCR).通过X射线衍射仪(XRD)、TGA-DTG分析、N2-等温吸附/脱附、H2-程序升温还原(TPR)和X射线光电子能谱仪(XPS)等技术对样品进行表征.N2-等温吸附/脱附和TGA-DTG分析结果表明,Fe-NaPILCS的比表面积和孔体积较海泡石原矿具有较大的增加,热稳定性也明显提高;XRD和XPS结果表明,在Cu/Fe-NaPILCS催化剂上同时存在Fe3+/Fe2+和Cu2+/Cu+不同氧化态的氧化物种,在Cu和Fe之间存在电子迁移.H2-TPR结果表明,Cu/Fe-NaPILCS催化剂上存在大量的孤立铜离子物种(isolated Cu2+-ions,(Cu2+)i).Fe柱撑钠化海泡石负载的Cu/Fe-NaPILCS催化剂的催化活性明显优于未柱撑海泡石负载的Cu/Fe-NaSep催化剂,这可能与Cu/Fe-NaPILCS具有较大的比表面积、孔体积和更优的氧化还原性能,及其具有更多有利于C3H6-SCR反应的(Cu2+)i物种有关.
Copper hydroxide loaded pillared sodium sepiolite Cu / Fe-NaPILCS catalyst was prepared by impregnation method using hydroxy iron ion pillared sodium sepiolite as the impregnation method. Fe-NaSep, Cu-NaSep and Cu / Fe-NaSep supported Cu-Fe-NaSep catalysts were prepared and applied to the selective catalytic reduction of NO by C3H6 (C3H6-SCR) .According to XRD, TGA-DTG analysis, N2-isothermal adsorption / desorption, TPR and XPS, The results of N2-isothermal adsorption / desorption and TGA-DTG analysis showed that the specific surface area and pore volume of Fe-NaPILCS increased greatly compared with that of sepiolite ore, and the thermal stability was also improved obviously. In the Cu / Fe-NaPILCS catalyst, there existed both oxidation states of Fe3 + / Fe2 + and Cu2 + / Cu + in different oxidation states with electron transfer between Cu and Fe. The results of H2-TPR showed that a large amount of Isolated Cu2 + -ions, (Cu2 +) i). Catalytic Activity of Fe Pillared Sodium Sepiolite-Loaded Cu / Fe-NaPILCS Catalysts Which is superior to that of Cu / Fe-NaSep catalyst loaded with unbonded sepiolite, which may have a larger specific surface area, pore volume and better redox properties than Cu / Fe-NaPILCS, and it has more advantages for C3H6 -SCR reaction (Cu2 +) i species.