The increasing presence of renewable energies on the electricity market makes it necessary to develop solutions for intermediate energy storage in order to compensate for fluctuating electricity availability. So-called "power-to-gas" processes are seen as promising options for this. Catalytic methanation is an essential step in this process. In this process, hydrogen is converted with a carbon source such as CO₂ into methane, which can be fed into the existing natural gas grid as SNG or converted back into electricity. A detailed understanding of the occurring mechanistic processes and the associated kinetic description is necessary for the reaction engineering design and optimization of reactors and processes. The highly exothermic nature of CO₂ methanation and the occurrence of side or parallel reactions pose challenges for the experimental investigation of the reaction, which serves as a foundation for an accurate mathematical description. In this project, CO₂ methanation is investigated in reactors, which enable the measurement of axial temperature and concentration profiles. In this way, intermediate products and temperature hot spots can be detected, which is not possible in classical differential or integral laboratory reactors. Ultimately, the methods allow the derivation of advanced kinetics and reactor models, which can be supplemented by particle-resolved CFD simulations.