| 摘要 |
Ag a-b M b V 2 O x * c H 2 O, whereby M is a metal selected from the group of Li, Na, K, Rb, Cs, Tl, Mg, Ca, Sr, Ba, Cu, Zn, Cd, Pb, Cr, Au, Al, Fe, Co, Ni and/or Mo, a has a value of 0.3-1.9 and, b a value of 0-0.5 with the proviso that the difference (a-b)>=0.1, c has a value of 0-20 und x is a number that is determined by the valence and frequency of elements different from oxygen in formula (I). The polymetal oxide has a crystalline structure that results in a powder x-ray diagram with diffraction reflexes for lattice differences of d 15.23 ± 0.6, 12.16 ± 0.4, 10.68 ± 0.3, 3.41 ± 0. 4, 3.09 ± 0.4, 3.02 ± 0.4, 2.36 ± 0,4 and 1.80 ± 0.4 Å. The invention also relates to precatalysts and catalysts for the partial oxidation of aromatic hydrocarbons. |
