NOx reduction by H2 on Pt and Pd catalysts in O2-rich exhaust gases

计划项目的主题是在稀燃废气中的铂和钯催化剂上催化氢气低温还原NOx。与现有的脱氮技术相比，H2-DeNOx的转化具有转化率高的优势，即使在200°C以下也是如此。预期的研究涉及以下几点：-详细的分子理解H2-DeNOx反应，以控制H2-DeNOx反应的活性和氮气选择性，使用铂和钯催化剂以及酸性载体CeO2、Tio、ZrO2和Al_2O_3-SiO_2以及促进剂WOX、SOX和POX。-了解促进剂和载体对活性成分结构和电子性质的影响。-了解分子反应机理，特别是阐明载体和促进剂的机理作用。特别是通过使用以X射线吸收和发射光谱为重点的原位分析技术。-基于对反应机理以及助剂和载体的影响的深入了解，合理改进铂和钯催化剂。-对最有希望用于固定式和移动式稀燃发动机(CH4、H2和柴油发动机)的催化剂进行技术评估。

The theme of the planned project lies in the catalytic low-temperature NOx reduction by H2 on Pt and Pd catalysts in lean combustion exhaust gases. Compared to the established denitrification techniques, the H2-deNOx conversion has the advantage of high conversion rates even below 200 ° C. The intended research addresses the following points:- Detailed molecular understanding of the H2-deNOx reaction to control H2-deNOx activity and N2 selectivity using Pt and Pd catalysts combined with the acidic supports CeO2, TiO2, ZrO2 and Al2O3-SiO2 as well as the promoters WOx, SOx and POx.- Understanding the influence of promoters and supports on the structural and electronic properties of the active component .- Knowledge of the molecular reaction mechanism, in particular clarification of the mechanistic role of support and promoter, especially by using in situ analysis techniques with focus on X-ray absorption and emission spectroscopy.- Rational improvement of the Pt and Pd catalysts based on the developed understanding of the reaction mechanism and the effects of promoter and support.- Technical evaluation of the most promising catalysts for stationary and mobile lean-burn engines (CH4, H2 and diesel engines).