Correlation of the broadband electric and catalytic properties of zeolite based NH3/SCR catalyst materials

研究催化剂材料的电性能及其与催化性能的关系具有很高的学术和技术意义。到目前为止，人们主要关注的是电子导电材料，气体的化学吸附会导致导电带或价带的载流子密度发生变化，这可以通过电导率或介电常数的变化来检测。对产物的同时分析将有助于了解结构-性能-关系，更好地理解基本的基本过程，并最终改进催化剂的设计。本项目的目的是通过在宽频率范围内的电测量来分析基于沸石的质子导电nh3 - scr催化剂的状态。两个项目合作伙伴的互补重点是微观理解和修饰沸石催化性能的载流子输运，以及通过阻抗和高频光谱对汽车催化剂的原位状态进行分析。这个项目应该跨越一个桥梁，从电学性质的微观理解到宏观模型应用于汽车催化剂装置。这种方法是以知识为基础的，涵盖了从科学、微观到工程模型的理解。

Investigations of the electric properties of catalyst materials and their correlation with the catalytic properties are of high academic and technical relevance. Up to now the attention has been preferentially paid to electron-conducting materials, where chemisorption of gases leads to a change in charge carrier density in the conduction or valance band, which can be detected by a change in conductivity or permittivity, respectively. Simultaneous analysis of the products should lead to access structure-property-relations and to a better understanding of the basic elementary processes and eventually to an improved catalyst design.Aim of this project is to analyze the state of zeolite-based, proton-conducting NH3-SCR-catalysts by means of electrical measurements over a broad frequency range. The complementary foci of both project partners are the microscopic understanding and modification of charge carrier transport in addiction to catalytic properties of zeolites and the in situ state analysis of automotive catalysts by means of impedance and high frequency spectroscopy. This project should span a bridge from the microscopic understanding of the electrical properties to the macroscopic model applied for automotive catalyst devices. The approach is knowledge-based overarching the scale of scientific, microscopic understanding up to the engineering model.