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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Experimental and modeling study of a dual-layer (SCR + PGM) NH3 slip monolith catalyst (ASC) for automotive SCR after treatment systems. Part 2. Validation of PGM kinetics and modeling of the dual-layer ASC monolith
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Experimental and modeling study of a dual-layer (SCR + PGM) NH3 slip monolith catalyst (ASC) for automotive SCR after treatment systems. Part 2. Validation of PGM kinetics and modeling of the dual-layer ASC monolith

机译：用于汽车SCR后处理系统的双层（SCR + PGM）NH3滑脱整体催化剂（ASC）的实验和模型研究。第2部分。PGM动力学的验证和双层ASC整体结构的建模

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摘要

We present herein the final part in the development and validation of a chemically and physically consistent mathematical model of a commercial dual-layer (SCR+ PGM) monolithic NH3 slip converter (ASC). Specifically, in this conclusive Part 2 of the project we first validate the global kinetic model for the PGM catalyst component, previously developed in Part 1 over the precursor powders, against data collected over a single-layer coated monolith. Then, we incorporate validated kinetics for the two individual SCR and PGM components into a dual-layer ASC monolith catalyst model and proceed to a systematic validation against experimental catalytic activity data collected over core samples of the dual-layer ASC system. A DOE approach is also adopted in order to secure a uniform coverage of the operating field. A positive interaction of the PGM and SCR catalytic chemistries is emphasized by the data collected over the dual-layer SCR+PGM monolith catalyst, leading to largely enhanced N2 selectivities as compared to a single-layer PGM-only washcoat. We show that such a beneficial interaction between the PGM and SCR chemistries occurs via diffusion/reaction of NH3 and NO_x in the SCR catalyst layer. Results prove that the dual-layer ASC model can simulate realistically the actual NH3 slip catalyst configuration over a wide range of representative conditions.
机译：我们在本文中介绍了商业双层（SCR + PGM）整体式NH3滑模转换器（ASC）的化学和物理上一致的数学模型的开发和验证的最后一部分。具体而言，在该项目的结论性第2部分中，我们首先根据在单层涂层整料上收集的数据，验证了先前在第1部分中针对前体粉末开发的PGM催化剂组分的全局动力学模型。然后，我们将两个SCR和PGM组分的验证动力学纳入双层ASC整体催化剂模型，并针对在双层ASC系统核心样品上收集的实验催化活性数据进行系统验证。为了确保对操作区域的均匀覆盖，还采用了DOE方法。通过双层SCR + PGM整体催化剂收集的数据强调了PGM和SCR催化化学反应的积极相互作用，与仅使用PGM的单层涂层相比，N2选择性大大提高。我们表明，PGM和SCR化学物质之间的这种有益相互作用是通过SCR催化剂层中NH3和NO_x的扩散/反应而发生的。结果证明，双层ASC模型可以在广泛的代表性条件下真实地模拟实际的NH3滑脱催化剂构型。

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