Reaction kinetics for automotive exhaust gas catalysts with reversible noble metal oxidation

这个跨学科的联合项目将结合工程方法和材料科学方法来描述汽车废气催化剂在可逆贵金属氧化方面的转化行为。材料科学方法允许以分子分辨率确定固相的状态。固相（在本例中为催化剂）的表征由原子探针层析成像（APT）进行。因此，将催化剂样品制备成半径为10-50nm的针尖，在选定的条件下进行处理，并通过APT进行分析。该项目的目标是开发一种方法，用于处理随反应条件变化的催化剂动力学模型。因此，我们将瞬态转换测量与原子组成测量结合起来，以获得对转换和反应的物理合理描述。该方法将在含有铂、钯和pt7pd合金的柴油废气催化剂上进行测试。化学过程工程研究所（ICVT）将提供反应转化的瞬态测量，以确定催化剂行为相关变化的反应条件。材料科学研究所（IMW）将提供活性材料的高分辨率表征。模拟和模拟将由ICVT进行。

This interdisciplinary joint project will combine engineering methods with material science methods to describe the conversion behaviour of automotive exhaust gas catalysts with respect to the reversible noble metal oxidation. Material science methods allow to determine the state of the solid phase with molecular resolution. The characterization of the solid phase (in this case the catalyst) is carried out by atom probe tomography (APT). Therefore a sample of the catalyst is prepared to a needlepoint of 10-50nm radius, treated under selected conditions and analysed via APT. The goal of the project is to develop a methodology for the processing of kinetic models for catalysts that change with reaction conditions. Therefore we combine transient conversion measurements with measurements of the atomic composition to gain physically sound descriptions of the transformations and reactions. The approach will be tested for diesel exhaust gas catalysts with platinum, palladium and Pt7Pd-alloys. The institute for chemical process engineering (ICVT) will provide transient measurements of the reaction conversions to determine amongst other things the reaction conditions for relevant changes in the catalyst behaviour. The institute for material science (IMW) will provide the high resolution characterization of the active material. Modelling and simulation will be conducted by ICVT.