Catalyst material for decreasing the nitrogen oxides in flue gases

The invention relates to a catalyst material comprising a hydrothermal titanium oxide known per se, to which vanadium oxide and one or more oxides of the elements tungsten, phosphorus, sulphur, chromium, zirconium, magnesium, copper, cobalt, iron and uranium have been added and which was then subjected to a process of milling activation. In the case of this catalyst material, the service life is to be further improved. The invention provides for this purpose that a molybdenum component is added subsequently to the milling activation and the mixture is then subjected to a temperature treatment. Furthermore, the invention provides that the mixture is heated in the course of the temperature treatment to a maximum of 650@C. A catalyst material according to the invention is suitable, in particular, for use in flue gases for decreasing the nitrogen oxides.