One of the main pollutants in the automobile engine exhausts is NO. Hydrocarbon based Selective catalytic reduction (HC-SCR) is one of the most preferred methods to reduce NO at the expense of unburned hydrocarbons, which are also present in automobile exhausts. In this study we have developed a detailed kinetic model and analysed the selectivity of NO reduction to various products (N₂, N₂O and NO₂). The optimal operating conditions for the maximum reduction of NO to N₂ are also explored. Various phenomena including coking & oxygen-rich nature of the catalyst surface are found to occur as the amount of oxygen in the inlet is varied. The influence of O₂ and temperatures on the selectivity of NO reduction is discussed in detail.

中文翻译：

---

汽车后处理中Pt催化剂上HC-SCR的NO生成N ₂，N ₂ O和NO _2的微动力学模型

汽车发动机排气中的主要污染物之一是NO。基于碳氢化合物的选择性催化还原（HC-SCR）是最理想的还原NO的方法之一，以未燃烧的碳氢化合物为代价，碳氢化合物也存在于汽车尾气中。在这项研究中，我们建立了详细的动力学模型并分析了NO还原对各种产物（N ₂，N ₂ O和NO ₂）的选择性。还探讨了将NO最大还原为N ₂的最佳操作条件。随着入口中氧气量的变化，发现了包括催化剂表面的焦化和富氧性质在内的各种现象。O ₂的影响 并详细讨论了温度对NO还原选择性的影响。