Catalysed filter system for treating particulate-containing exhaust gas from stationary emission sources

A catalysed filter system for treating particulate-containing exhaust gas from a stationary emission source, which system comprising an elongate filter element comprising porous walls which define a hollow section and a substrate material supporting a catalyst component disposed within the hollow section, the arrangement being such that gas entering the hollow section of the elongate filter element from across the porous walls thereof must contact the substrate material supporting the catalyst component before exiting the hollow section of the elongate filter element, the catalysed filter system comprising a cartridge structure insertable into the hollow section of the elongate filter element, wherein the cartridge structure retains or holds the substrate material, wherein the cartridge structure comprises a central porous hollow section around which the substrate material is arranged, wherein the substrate material is one or more layers of a knitted gauze, a cotton gauze, a wire mesh, an alumina fibre paper, a glass fibre paper or a quartz fibre paper disposed around the central porous hollow section,

• wherein the catalyst component is active for catalysing selective catalytic reduction of oxides of nitrogen with a nitrogenous reductant, or for catalysing oxidation of gas components,
• wherein catalyst component active for selective catalytic reduction comprises a vanadium compound impregnated onto the substrate material, and
• wherein the catalyst component active for oxidation comprises at least one of cobalt, manganese, copper, iron, a platinum group metal, silver or gold supported on a particulate refratory oxide.