| 摘要 |
Multimetal oxide composition is a multimetal oxide (I) of molybdenum with vanadium, niobium, tantalum, tungsten and/or rhenium and boron, silicon, phosphorus, germanium, arsenic and/or antimony and optionally other metal(s) in the form of crystallites of constant composition. Multimetal oxide composition is of formula (I); (A)p(B)q (I) Mo12X<1>aX<2>bX<3>cX<4>dX<5>eOx (II) MofX<6>gX<7>hOy (III) A = a multimetal oxide of formula (II); B = a multimetal oxide of formula (III); X<1> = hydrogen, up to 97 mole-% of which may be replaced by ammonium, potassium, rubidium and/or cesium; X<2> = vanadium, niobium (Nb), tantalum (Ta), tungsten and/or rhenium; X<3> = boron, silicon, phosphorus, germanium, arsenic and/or antimony (Sb); X<4> = chromium, manganese, iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr) and/or barium (Ba); X<5> = sulfur; X<6> = Cu, Fe, Co, Ni, Zn, cadmium, Mn, Mg, Ca, Sr and/or Ba; X<7> = Nb, Ta and/or Sb; a = 1-3; b = 0.1-2; c = 0-5; d, e = 0-1; f = 0-2; g = 0.5-1.5; h = 2-4; x, y = values depending on the valency and frequency of elements other than oxygen; p = 1; and q = 0; or p, q not = 0 and p/q = (160-1):1 The standard deviation of the stoichiometric coefficient a of the variable X<1> of individual crystallites of component A is less than 0.40, preferably less than 0.20, especially less than 0.11. An Independent claim is also included for the preparation of multimetal oxide (I).
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