The goal of Project Area B is the design, catalytic performance testing and tracking of the formation and fate of the active site(s) in porous powder model catalysts, as well as building an understanding by molecular and multiscale modeling. Monometallic and bimetallic Pt and/or Pd clusters and nanoparticles (defined particle sizes from below 1-20 nm) will be prepared on CeO2, TiO2 and Al2O3 supports.