ProMet - CO2 to Propene via eMethanol
Within the framework of the joint project ProMet, funded by the BMBF, a single-stage electrochemical process is being developed to convert CO2 to methanol on an industrial scale. In a second process step, methanol will be converted to propene, which is an essential raw material for the chemical industry and is currently obtained entirely from fossil sources. The use of CO2 as a raw material is a promising approach to reducing emissions.
Due to the low solubility of CO2 in aqueous solutions, only very low current densities are achieved at conventional electrodes because mass transport is limiting. Therefore gas diffusion electrodes (GDE) are used, which allow technically relevant current densities by converting CO2 from the gas phase.
Depending on the used catalyst material, a very wide product range is possible. However, the selectivity towards methanol is currently still a great challenge, as the reaction is kinetically and mechanistically much more complex than, for example, the conversion to formate or CO. For this reason, new electrodes will be developed in the subproject at Clausthal University of Technology, which will be manufactured using a wet spray process. For this purpose, a test rig will first be set up to characterize the produced GDEs. A further goal of TU Clausthal is to transfer existing mathematical models for GDE to the conditions of CO2 electrolysis.