| abstract |
An amorphous solid gel containing molybdenum and iron contains (a) ions of a ferric salt and ions from at least one salt containing, as simple cations, a metal M, in an atomic ratio M/ (Fe+M) from 0 to 0.5:1 (b) ions from a molybdic compound and ions from at least one salt containing, as oxygenated ions, a metal N, in an atomic ration N/ (Mo+N) from 0 to 0.5:1; and (c) water, wherein M is Co, Ni, Mn, Cr, Sc, Y or a rare earth metal, N is Cr, W, Mn, or V and (Mo+N) / (Fe+M) is 0.4:1 to 5:1. |