Within the framework of CO2BioFeed, an approach to the sustainable industrial production of base chemicals is to be developed. The aim of the project is to convert CO2 with olefins from renewable sources into valuable intermediates. The key is to use CO2 as an oxidant for the epoxidation of lower alkenes and as a carboxylating agent for insertion into the C-H bonds of lower alkenes, producing acrylic acid derivatives. In this project, silver catalysts supported on mixed oxides (Mo, V, Te, Ce, Zr) tailored for CO2 conversion will be characterized. The hazard potential of the samples is considered low. XPS analysis is a key to the comprehensive characterization of the catalysts and deriving structure-performance relationships.