Reduced Cerium Configurations In CeO2/Ag Inverse Catalysis

•Ab-initio calculations of Ce atoms reduction in 1ML and 2ML thick films on a silver support.•Study of electronic charge transfers between the support and film.•Determination of 2D ordered superstructures of cerium reduced atoms.•Calculation of oxygen vacancy formation energies.•Dependence of the 2D reduced Ce atom structures on O vacancy position.