A catalysed soot filter comprising an oxidation catalyst for treating carbon monoxide (CO) and hydrocarbons (HCs) in exhaust gas from a compression ignition engine disposed on a filtering substrate, wherein the oxidation catalyst comprises: a platinum group metal (PGM) component selected from the gr
A catalysed soot filter comprising an oxidation catalyst for treating carbon monoxide (CO) and hydrocarbons (HCs) in exhaust gas from a compression ignition engine disposed 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.
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1. A catalysed soot filter comprising an oxidation catalyst for treating carbon monoxide (CO) and hydrocarbons (HCs) in exhaust gas from a compression ignition engine disposed on a filtering substrate, wherein the oxidation catalyst comprises: a platinum group metal (PGM) component selected from the
1. A catalysed soot filter comprising an oxidation catalyst for treating carbon monoxide (CO) and hydrocarbons (HCs) in exhaust gas from a compression ignition engine disposed 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; anda support material comprising a modified alumina incorporating a heteroatom component; wherein the total amount of the alkaline earth metal component is 10 to 500 gft−3. 2. A catalysed soot filter according to claim 1, wherein the modified alumina incorporating a heteroatom component is an alumina doped with a heteroatom component, an alkaline earth metal aluminate or a mixture thereof. 3. A catalysed soot filter according to claim 1, wherein the heteroatom component comprises silicon, magnesium, barium, lanthanum, cerium, titanium, zirconium or a combination of two or more thereof. 4. A catalysed soot filter according to claim 1, wherein the modified alumina incorporating a heteroatom component is alumina doped with silica. 5. A catalysed soot filter according to claim 4, wherein the alumina is doped with silica in an amount of 0.5 to 45% by weight. 6. A catalysed soot filter according to claim 1, wherein the modified alumina incorporating a heteroatom component is an alkaline earth metal aluminate. 7. A catalysed soot filter according to claim 6, wherein the alkaline earth metal aluminate is magnesium aluminate. 8. A catalysed soot filter according to claim 1, wherein the alkaline earth metal component comprises magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) or a combination of two or more thereof. 9. A catalysed soot filter according to claim 8, wherein the alkaline earth metal component comprises strontium (Sr) or barium (Ba). 10. A catalysed soot filter according to claim 1, wherein the oxidation catalyst comprises a single layer disposed on the filtering substrate, wherein the single layer comprises the platinum group metal (PGM) component selected from the group consisting of a platinum (Pt) component, a palladium (Pd) component and a combination thereof; the alkaline earth metal component; and the support material. 11. A catalysed soot filter according to claim 1, wherein the oxidation catalyst comprises two layers, wherein a first layer is disposed on the filtering substrate and a second layer is disposed on the first layer. 12. A catalysed soot filter according to claim 1, wherein the oxidation catalyst comprises a first zone and a second zone in a side-by-side arrangement on the substrate. 13. A catalysed soot filter according to claim 1, wherein the filtering substrate is a ceramic wallflow filter. 14. An exhaust system for a compression ignition engine comprising a catalysed soot filter according to claim 1. 15. An exhaust system according to claim 14, wherein the oxidation catalyst comprises a first zone and a second zone in a side-by-side arrangement on the substrate and wherein the second zone is upstream of the first zone. 16. An exhaust system according to claim 14, comprising a diesel oxidation catalyst disposed on a separate flow-through substrate monolith, which is disposed upstream of the catalysed soot filter. 17. A compression ignition engine comprising an exhaust system according to claim 14. 18. A method of treating carbon monoxide (CO) and hydrocarbons (HCs) and NO2 in an exhaust gas from a compression ignition engine, which method comprises contacting the exhaust gas with a catalysed soot filter according to claim 1. 19. A method according to claim 9, wherein the oxidation catalyst comprises a first zone and a second zone in a side-by-side arrangement on the substrate and wherein the exhaust gas contacts the second zone before the first zone.
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