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首页> 外文会议>AIChE annual meeting >Investigation of Surface and Bulk Ba-Nox Species in Lean Nox Storage Materials
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Investigation of Surface and Bulk Ba-Nox Species in Lean Nox Storage Materials

机译：稀薄NOx储存材料中表面和块状Ba-Nox种类的研究

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摘要

Nox storage-reduction (NSR) catalysts or Lean Nox Traps (LNT) provide an effective method for Nox removal in lean exhaust. It is generally accepted that there are four main steps comprising the Nox storage and reduction process, including oxidation of NO to NO2 and storage of NO2 under lean conditions, and release of stored Nox and reduction to N2 under rich conditions. The storage and release of Nox are important determinants of Nox storage capacity and thermal durability under cyclic operation. The nature of the active storage species and the role of surface and bulk phases in storage are poorly understood. In this work, we examine the relative thermal stability of possible in Ba-based Nox storage materials. We prepare bulk and surface model systems, including bulk Ba(NO3)2, aluminasupported Ba(NO3)2, and Ba(NO3)2 species generated in-situ by exposing BaO-Al2O3 to NO2 streams at room temperature. The structural and thermal characteristics were investigated using FTIR, XRD, TPD, and TGA coupled with chemical ionization MS. The role of these species under different thermal conditions is discussed in light of their consequences for LNT performance.
机译：减少NOx的存储（NSR）催化剂或稀薄的NOx捕集阱（LNT）为去除稀薄排气中的NOx提供了有效的方法。通常认为有四个主要步骤，包括NOx的存储和还原过程，包括将NO氧化为NO2和在稀薄条件下存储NO2，以及在富裕的条件下释放所存储的Nox并将其还原为N2。 NOx的储存和释放是循环操作下Nox储存容量和热耐久性的重要决定因素。人们对活性存储物质的性质以及表面相和本体相在存储中的作用知之甚少。在这项工作中，我们研究了Ba基Nox储存材料中可能的相对热稳定性。我们准备了体积和表面模型系统，包括本体Ba（NO3）2，氧化铝负载的Ba（NO3）2和通过在室温下将BaO-Al2O3暴露于NO2流而原位生成的Ba（NO3）2物种。使用FTIR，XRD，TPD和TGA结合化学电离MS对结构和热学特性进行了研究。根据它们对LNT性能的影响，讨论了这些物质在不同热条件下的作用。

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