Oxidation catalyst for treating the exhaust gas of a compression ignition engine

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A catalyzed soot filter comprises an oxidation catalyst for treating carbon monoxide (CO) and hydrocarbons (HCs) in exhaust gas from the compression ignition engine deposited on a filtering substrate, wherein 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 a combination thereof; an alkaline earth metal component; a support material comprising a modified alumina incorporating a heteroatom component. The alkaline earth component may be present in the amount of 10-500 gft-3. The heteroatom component may be silicon, magnesium, barium, lanthanum, cerium, titanium, titanium, zirconium or a combination of two or more of the above. The modified alumina incorporating a heteroatom component may be an alumina doped with a heteroatom component, an alkaline earth metal aluminate or a mixture thereof.