Catalytic Methanation of Carbon Dioxide
Renewable energies are continuously being expanded to reduce the negative environmental impact of fossil fuels. Due to the considerable fluctuations in the performance of wind and solar energy, possibilities for intermediate energy storage are required. Catalytic methanation is a sub-step of the “power-to-gas process”. Here, hydrogen is converted to methane with a carbon source such as CO2. The produced methane can be fed into the existing natural gas grid or converted back into electricity. The high exothermicity of this reaction places special demands on the heat removal from the fixed bed reactors typically used. For this purpose, experimental and theoretical studies are carried out on reactors with different diameters and various pellet shapes. In addition to the use of classical models, particle-resolved CFD simulations will also be carried out. With these, each catalyst pellet is spatially resolved, which makes it possible to precisely map the local structure of a fixed bed. In addition to the flow around the pellets, the processes in the catalyst are also described within the scope of the project. This model will then be integrated into a particle-resolved simulation of the entire reactor.