The entire Chemical Process Engineering group congratulates PhD student Harm Ridder on the completion of his doctoral thesis, during which he made great progress in the field of 3D imaging in catalytic reactors. As a result of his groundbreaking work, it is now possible to measure three-dimensionally resolved temperatures within a methane-containing gas phase, and this method can also be extended to other species. These successes are so groundbreaking because they make it possible to detect local temperature hotspots in reactors without having to intervene in the reactor (non-invasive method). This lays the foundation for better understanding and optimizing the processes within reactors in the future. Congratulations on this success!