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首页> 外文期刊>Catalysis science & technology >Highly efficient nanosized Mn and Fe codoped ceria-based solid solutions for elemental mercury removal at low flue gas temperatures
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Highly efficient nanosized Mn and Fe codoped ceria-based solid solutions for elemental mercury removal at low flue gas temperatures

机译：高效的纳米纳米型MN和Fe codoped Ceria的固体解决方案，用于在低烟气温度下去除元素汞

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摘要

Ceria (CeO2) is a well-known material for various industrial applications due to its unique redox properties. Such properties, dominated by structural defects that are primarily oxygen vacancies associated with the Ce3+/Ce4+ redox couple, can be easily modulated and optimized by different approaches. In this paper, nanosized Mn and Fe codoped CeO2 solid solutions, Ce0.7-xMn0.3FexO2-delta (x = 0.05-0.2), were prepared by a simple coprecipitation method and tested towards elemental mercury (Hg-0) oxidation and adsorption. The obtained solid solutions were characterized in detail at the structural and electronic level by various techniques, namely, XRD, ICP-OES, BET surface area, TEM, Raman, H-2-TPR, and XPS. The XRD results suggest that the Mn and/or Fe dopant cations are effectively incorporated into the CeO2 lattice. BET surface area results suggest that the addition of Mn and/or Fe dopants to CeO2 significantly reduces its crystallite size and thereby improves the surface area. Raman, H-2-TPR, and XPS results reveal that the Mn and/or Fe dopant cations in the ceria lattice increased the concentration of structural oxygen vacancies and the reducibility of the redox pair Ce4+/Ce3+. The Hg-0 oxidation and adsorption studies indicate that Ce0.7-xMn0.3FexO2-delta solid solutions exhibited the highest activity compared to pure CeO2. In particular, the Ce0.5Mn0.3Fe0.2O2-delta (CMF20) solid solution shows an Hg-0 oxidation efficiency (E-oxi) of 86.5%. It was found that the doping of both Mn and Fe led to lattice distortion and restrained growth of CeO2, resulting in synergistic increase in oxygen vacancies and catalytic activity.
机译：由于其独特的氧化还原特性，销女（CEO2）是各种工业应用的众所周知的材料。这种特性以与CE3+/CE4+氧化还原夫妇相关的主要是氧空位为主的，可以通过不同的方法轻松调节和优化。在本文中，通过一种简单的共沉淀方法制备了纳米化的Mn和Fe Codoped CEO2固溶性，CE0.7-XMN0.3FEXO2-DELTA（X = 0.05-0.2） 。通过各种技术，即XRD，ICP-OES，BET表面积，TEM，Raman，H-2-TPR和XPS在结构和电子水平上详细表征所获得的实体溶液。 XRD结果表明，MN和/或Fe掺杂阳离子有效地掺入CEO2晶格中。 BET表面积的结果表明，在CEO2中添加Mn和/或Fe掺杂剂可显着降低其结晶石的大小，从而改善表面积。拉曼，H-2-TPR和XPS的结果表明，陶瓷晶格中的Mn和/或Fe掺杂阳离子增加了结构氧空位的浓度以及氧化还原对CE4+/CE3+的降低。 HG-0氧化和吸附研究表明，与纯CEO2相比，CE0.7-XMN0.3FEXO2-DELTA固定溶液的活性最高。特别是，CE0.5MN0.3FE0.2O2-DELTA（CMF20）固体溶液显示HG-0氧化效率（E-OXI）为86.5％。发现Mn和Fe的掺杂导致晶格失真和CEO2的约束生长，从而导致氧空位和催化活性的协同增加。

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