Method for preparing metal oxidizing acid salt and said salt
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A technology of antimony trioxide and hydrogen peroxide, applied in the field of multi-metal oxide materials of formula, can solve the problems such as incomplete selectivity of active acrylic acid and the like
Inactive Publication Date: 2004-07-28
BASF AG
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[0009] A disadvantage of the multimetal oxide materials of the prior art is that their activity and selectivity to acrylic acid are not entirely satisfactory when they are used as catalysts for the gas-phase catalytic oxidation of acrolein to acrylic acid
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[0049] I. Preparation of Catalyst
[0050] Example
[0051] a) Preparation of raw material 1
[0052] 946.0 grams of Sb with a Sb content of 83.0% (by weight) were mixed under stirring 2 o 3 Suspended in 4 liters of water. At room temperature (25°C), 822.4 grams of 30% (by weight) H 2 o 2 Aqueous solution was added. Thereafter, the suspension was heated to 100° C. within 1 hour, stirred further, and refluxed at this temperature for 5 hours. Then 595.6 grams of Cu(CH) with a Cu content of 32.0% by weight 3 COO) 2 ·H 2 A solution of O in 4 liters of water was added to the aqueous suspension at 100°C within 30 minutes and the temperature of the entire aqueous mixture dropped to 60°C. 407.9 g of a 25% strength by weight aqueous ammonia solution are then added at this temperature. Thereafter, the aqueous suspension was stirred for a further 2 hours at 80° C. and then cooled to room temperature (25° C.). Finally, the aqueous suspension was spray-dried (inlet temperature:...
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Abstract
The invention relates to multi-metal oxide compounds with a 2-component structure, containing molybdenum, vanadium, antimony, one or more of the elements W, Nb, Ta, Cr and Ce and one or more of the elements Cu, Zn, Co, Fe, Cd, Mn, Mg, Ca, Sr and Ba. The invention also relates to the use of said compounds for producing acrylic acid by means of a gas phase catalytic oxidation process.
Description
technical field [0001] The present invention relates to multimetal oxide materials of formula (I) [0002] (A) p (B) q (I) In the formula, A is Mo 12 V a x 1 b x 2 c x 3 d x 4 e x 5 f x 6 g o x , B for X 7 1 Sb h h i o y , X 1 is W, Nb, Ta, Cr and / or Ce, preferably W, Nb and / or Cr, X 2 is Cu, Ni, Co, Fe, Mn and / or Zn, preferably Cu, Ni, Co and / or Fe, X 3 is Sb and / or Bi, preferably Sb, X 4 is Li, Na, K, Rb, Cs and / or H, preferably Na and / or K, X 5 is Mg, Ca, Sr and / or Ba, preferably Ca, Sr and / or Ba, X 6 is Si, Al, Ti and / or Zr, preferably Si, Al and or Ti, X 7 is Cu, Zn, Co, Fe, Cd, Mn, Mg, Ca, Sr and / or Ba, preferably Cu, Ni, Zn, Co and / Fe, particularly preferably Cu and / or Zn, most preferably Cu, a is 1 -8, preferably 2-6, b is 0.2-5, preferably 0.5-2.5, c is 0-23, preferably 0-4, d is 0-50, preferably 0-3, e is 0-2, preferably 0- 0.3, f is 0-5, preferably 0-2, g is 0-50, preferably 0-20, h is 0.1-50, preferably 0.2-20, p...
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