Patent number: 5686373
Abstract: Polymetal oxide materials of the general formula I?A!.sub.p ?B!.sub.q (I),where ##STR1## X.sup.1 is W, Nb, Ta, Cr and/or Ce, X.sup.2 is Cu, Ni, Co, Fe, Mn and/or Zn,X.sup.3 is Sb and/or Bi,X.sup.4 is Li, Na, K, Rb, Cs and/or H,X.sup.5 is Mg, Ca, Sr and/or Ba,X.sup.6 is Si, Al, Ti and/or Zr,X.sup.7 is Mo, W, V, Nb and/or Ta,a is from 1 to 8,b is from 0.2 to 5,c is from 0 to 23,d is from 0 to 50,e is from 0 to 2,f is from 0 to 5,g is from 0 to 50,h is from 4 to 30,i is from 0 to 20,x and y are each a number which is determined by the valency and frequency of the elements other than oxygen in I and p and q are non-zero numbers whose ratio p/q is from 160:1 to 1:1,and their use as catalysts.
Type:
Grant
Filed:
February 22, 1995
Date of Patent:
November 11, 1997
Assignee:
BASF Aktiengesellschaft
Inventors:
Andreas Tenten, Friedrich-Georg Martin, Hartmut Hibst, Laszlo Marosi, Veronika Kohl