Multimetal oxides containing Mo, V and at least one of the elements W, Nb, Ti, Zr, Hf, Ta, Cr, Si and Ge and having a special three-dimensional atomic arrangement are used in catalysts for the catalytic gas-phase oxidation of organic compounds.
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[ We claim:] [1.] A multimetal oxide material having at least two phases and of the formula III EQU [A].sub.p [B].sub.q (III),wherein ]EQU2 ](active phase), EQU B=M.sub.12.sup.3 Cu.sub.d H.sub.e O.sub.y (promoter phase),M.sup.1 is W or Nb,M.sup.2 is Ti, Zr, Hf, Ta, Cr, Si or Ge,a is from 0.1 to 6,b
[ We claim:] [1.] A multimetal oxide material having at least two phases and of the formula III EQU [A].sub.p [B].sub.q (III),wherein ]EQU2 ](active phase), EQU B=M.sub.12.sup.3 Cu.sub.d H.sub.e O.sub.y (promoter phase),M.sup.1 is W or Nb,M.sup.2 is Ti, Zr, Hf, Ta, Cr, Si or Ge,a is from 0.1 to 6,b is from 0 to 6,c is from 0 to 6,with the proviso that a+b+c is from 0.1 to 6,x is a number which is determined by the valency and frequency of the elements in A other than oxygen,M.sup.3 is Mo, W, V, Nb or Ta,d is from 4 to 30,e is from 0 to 20,y is a number which is determined by the valency and frequency of the elements in B other than oxygen,p and q are numbers other than zero, whose ratio p/q is from 160:1 to 1:1,which contains the moiety [A].sub.p in the form of three-dimensional regions A which are delimited from their local environment owing to their chemical composition differing from their local environment and are of the chemical composition EQU Mo.sub.12-a-b-c V.sub.a M.sub.b.sup.1 M.sub.c.sup.2 O.sub.x Aand the moiety [B].sub.q in the form of three dimensional regions B which are delimited from their local environment owing to their chemical composition differing from their local environment and are of the chemical composition EQU M.sub.12.sup.3 Cu.sub.d H.sub.e O.sub.y Bwhere the regions A and B are distributed relative to one another as in a mixture of finely divided A and finely divided B and, with the use of CuK.alpha. radiation (.lambda.=1.54178 .ANG.), the three-dimensional atomic arrangement of the regions A gives an X-ray powder diffraction spectrum (the intensity of the diffracted X-rays plotted as a function of twice the diffraction angle (2.crclbar.)) which, in the 2.crclbar. range from 5 to 50.degree., contains at least the following characteristic diffraction lines A.sup.1, A.sup.3, A.sup.5, A.sup.9 and A.sup.10 but not more than the following diffraction lines A.sup.1 to A.sup.10 :
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