A catalytic soot filter includes an oxidation catalyst on a filter substrate for treating carbon monoxide (CO) and hydrocarbons (HC) from the exhaust of a compression ignition engine. The oxidation catalyst comprises: a platinum group metal (PGM) component selected from the group consisting of a platinum (Pt) component, a palladium (Pd) component, and combinations thereof,an alkaline earth metal component,and a modified alumina support that is doped with heteroatoms.