14- 5 O ( [...] ) Vanadium mixed oxides of the Cs structure type

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The invention relates to mixed oxide of the formula (1) with ( [...] ) [...] structure of the Cs 5 O 14 -Type : M 1 V p A q B r C s O n , wherein M is one or more elements, selected from the group consisting of molybdenum and tungsten is; V is vanadium is; A is one or more elements, selected from the group of niobium, tantalum, bismuth, phosphorus, zirconium, titanium, hafnium, gallium, chromium, iron, cobalt, aluminum, rhenium, manganese, ruthenium, germanium, indium, tin, boron and rare earth metals is; B for one or more elements, selected from the group consisting of the alkali metals, alkaline earth metals, thallium and zinc is; C for one or more elements, selected from the group consisting of palladium, platinum, gold, silver, rhodium, iridium, nickel and copper is; O is oxygen; p, q, r, s and n each represent the atomic ratios of M, V, A, B, carbon and are O, with the proviso that p = 0.001 to 2 ; q = 0 to 0, 9 ; r = 0 to 0, 2 ; s = 0 to 0, 1 by the valence requirements of the elements present and n is a specified number.