Sm-doped manganese-based Zr–Fe polymeric pillared interlayered montmorillonite for low temperature selective catalytic reduction of NOx by NH3 in metallurgical sintering flue gas,RSC Advances

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Sm-doped manganese-based Zr–Fe polymeric pillared interlayered montmorillonite for low temperature selective catalytic reduction of NOx by NH3 in metallurgical sintering flue gas
RSC Advances ( IF 3.9 ) Pub Date : 2018-12-18 00:00:00 , DOI: 10.1039/c8ra09434a
Zhicheng Han ₁ , Qingbo Yu ₁ , Zhijia Xue _{1,

2} , Kaijie Liu ₁ , Qin Qin ₁

Affiliation

In this work, Sm-doped manganese supported Zr–Fe polymeric pillared interlayered montmorillonites (Mn/ZrFe-PILMs) were prepared for the low-temperature selective catalytic reduction (SCR) of NO_x with NH₃ in metallurgical sintering flue gas. These pillared interlayered montmorillonite catalysts were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy, nitrogen adsorption–desorption isotherm, ammonia temperature-programmed desorption, and hydrogen temperature-programmed reduction to study the influence of Sm doping on the SCR performance. The ZrFe-PILMs with a Mn/Sm molar ratio of 18 : 2 showed the excellent SCR activity among these catalysts, where a 95.5% NO_x conversion ratio at 200 °C at a space velocity of 20 000 h⁻¹ was obtained. Samarium oxide and manganese oxides were highly dispersed on the ZrFe-PILMs with different Mn/Sm molar ratios by the XRD results and SEM-EDS results. Meanwhile, the Mn–Sm/ZrFe-PILM (18 : 2) had the lowest temperature hydrogen reduction peak by H₂-TPR results, which indicated that it had the lowest active bond energy on its surface. And the NH₃-TPD results expressed that the Mn–Sm/ZrFe-PILM (18 : 2) had the most acidic sites, especially the weakly acidic sites. Therefore, it was found that the introduction of a small amount of Sm (Mn : Sm = 18 : 2) to Mn/ZrFe-PILM can significantly improve catalytic activity by the increased active oxygen component and the surface acidity.

中文翻译：

Sm掺杂锰基Zr-Fe聚合物柱层夹层蒙脱土用于NH3低温选择性催化还原冶金烧结烟气中的NOx

在这项工作中，制备了 Sm 掺杂的锰负载 Zr-Fe 聚合物柱层夹层蒙脱石 (Mn/ZrFe-PILMs)，用于冶金烧结烟气中的 NO _x与 NH ₃的低温选择性催化还原 (SCR) 。这些柱状夹层蒙脱石催化剂通过X射线衍射、扫描电子显微镜和能量色散光谱、氮气吸附-解吸等温线、氨程序升温解吸和氢气程序升温还原来研究Sm掺杂对SCR性能的影响. Mn/Sm 摩尔比为 18:2 的 ZrFe-PILM 在这些催化剂中表现出优异的 SCR 活性，其中 NO _{x为 95.5%}^{获得了在 200 °C 和 20 000 h -1}的空速下的转化率。XRD结果和SEM-EDS结果表明，氧化钐和氧化锰高度分散在不同Mn/Sm摩尔比的ZrFe-PILMs上。_{同时，H 2} -TPR结果显示Mn-Sm/ZrFe-PILM(18:2)的氢还原峰温度最低，表明其表面活性键能最低。NH ₃ -TPD结果表明Mn-Sm/ZrFe-PILM(18:2)的酸性位点最多，尤其是弱酸性位点。因此，发现在Mn/ZrFe-PILM中引入少量Sm（Mn:Sm=18:2）可以通过增加活性氧组分和表面酸度来显着提高催化活性。

更新日期：2018-12-18

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