Patent ID: 6184173
Filing Date: 2001-02-06
Classification: B01J,C07C

Abstract:
A multimetal oxide material having at least two phases and of the formula III[A].sub.p [B].sub.q (III),wherein ##EQU2##(active phase),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 compositionMo.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 compositionM.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 :Diffraction line 2.crclbar. [.degree.] A.sup.1 8.3 .+-. 0.7 A.sup.2 14.4 .+-. 0.7 A.sup.3 22.3 .+-. 0.2 A.sup.4 23.5 .+-. 0.7 A.sup.5 27.2 .+-. 0.4 A.sup.6 32.0 .+-. 0.8 A.sup.7 34.8 .+-. 0.6 A.sup.8 38.7 .+-. 0.5 A.sup.9 45.4 .+-. 0.4 A.sup.10 48.8 .+-. 0.4