The implemented conjugated heat and mass transfer model for coupling the reaction inside the porous catalyst with the fluid flow is tested and validated for three different geometries illustrated in Figure . A visualization of the meshes utilized for these geometries can be found in the supplementary information (SI Section S5.1). All simulations are performed on a 64 bit server with two AMD Epyc 7281 processors (32 CPU in total) and 512 GB RAM.