Spatially and Temporally Resolved Measurements of NO Adsorption/Desorption over NOx‐Storage Catalyst,ChemPhysChem

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Spatially and Temporally Resolved Measurements of NO Adsorption/Desorption over NOx‐Storage Catalyst
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-10-29 , DOI: 10.1002/cphc.202000765
Sui Wan ₁ , Yiran Guo ₂ , Thomas Häber ₂ , Rainer Suntz ₂ , Olaf Deutschmann _{1,

2}

Affiliation

The two‐dimensional (2D) temporal evolution of the NO‐concentration over a NOx‐storage catalyst is investigated in situ with planar laser‐induced fluorescence (PLIF) in an optically accessible parallel wall channel reactor. Signal accumulated phase‐correlated 2D‐recordings of repetitive adsorption/desorption cycles are obtained by synchronizing the switching of the NO gas flow (on/off) with the laser and detection system, thereby significantly increasing the signal‐to‐noise ratio. The gas compositions at the reactor outlet are additionally monitored by ex‐situ analytics. The impacts of varying feed concentration, temperature and flow velocities are investigated in an unsteady state. Transient kinetics and the mass transfer limitations can be interpreted in terms of the NO concentration gradient changes. The technique presented here is a very useful tool to investigate the interaction between surface kinetics and the surrounding gas flow, especially for transient catalytic processes.

中文翻译：

NOx 存储催化剂上 NO 吸附/解吸的空间和时间分辨测量

在光学可访问的平行壁通道反应器中，利用平面激光诱导荧光 (PLIF) 原位研究了 NOx 存储催化剂上 NO 浓度的二维 (2D) 时间演化。通过将 NO 气流的切换（开/关）与激光和检测系统同步，获得重复吸附/解吸循环的信号累积相位相关二维记录，从而显着提高信噪比。反应器出口处的气体成分还通过异位分析进行监测。在非稳态下研究了不同进料浓度、温度和流速的影响。瞬态动力学和传质限制可以用 NO 浓度梯度变化来解释。这里介绍的技术是研究表面动力学与周围气流之间相互作用的非常有用的工具，特别是对于瞬态催化过程。

更新日期：2020-12-02

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