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

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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.