Catalysts of general formula (I): [AaBbOx]p [CcDdFeeCofEiFjOy]q, in which the variables have the following meanings: A = bismuth, tellurium, antimony, tin and/or copper; B = molybdenum and/or tungsten; C = an alkaline metal, thallium and/or samarium; D = an alkaline earth metal, nickel, copper, cobalt, manganese, zinc, tin, cerium, chromium, cadmium, molybdenum, bismuth and/or mercury; E = phosphorus, arsenic, boron and/or antimony; F = a rare-earth metal, vanadium and/or uranium; a = 0.01 to 8; b = 0.1 to 30; c = 0 to 4; d = 0 to 20; e = 0 to 20; f = 0 to 20; i = 0 to 6; j = 0 to 15; x and y are figures determined by the valency and frequency of the elements in (I) differing from oxygen and p and q are figures, the ratio p/q of which lies in the range from 0.001 to 0.099, and a process for producing said catalysts, their use for the ammono-oxidation, oxidation or dehydrogenation of ethylenically unsaturated compounds and a process for ammono-oxidation, oxidation or oxidative dehydrogenation of ethylenically unsaturated compounds in the presence of the catalyst of the invention.