DFT study on the storage mechanisms of NOx on the BaO surface

Abstract

在稀燃条件下NOx的消除是尾气净化技术的关键,其中NOx吸附还原催化剂(NSR)已成为研究热点之一。NSR催化剂的主要成分为Pt/BaO/Al2O3,其中BaO是主要的吸收剂,但对其吸附NOx的微观机理仍不清楚。本文采用密度泛函(B3LYP)结合簇模型及平板模型的计算方法,系统地研究了NOx(x=1,2)在BaO表面的吸附反应机理,以及O2/H2O/CO2等对NOx吸附反应的影响,主要结论如下:(1)NO2主要通过解离机理或分子吸附机理在BaO表面反应。在NO2浓度较低时,NO2在BaO表面储存通过解离机理进行,即NO2首先在表面氧位解离为[NO(ads)+O22-],得到的O22-可作为氧化...The Pt-BaO/Al2O3 catalyst system is a typical NSR catalyst to remove NOx under the lean-burn conditions. However, the storage mechanism of the NSR catalysts, especially in thermodynamical aspect, is still unclear. In this dissertation we carry out systematic DFT calculations of NOx storage mechanism on the BaO surface, and the main conclusions are summarized as follows: (1) For NO2 storage on th...学位:理学博士院系专业:化学化工学院化学系_物理化学学号:B20042504

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