Coated catalysts comprising a multimetal oxide comprising molybdenum, bismuth and iron
AssigneeBASF SE
InventorsAlexander Czaja, Martin Kraus
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Abstract
The invention relates to a coated catalyst, which is obtainable from a catalyst precursor comprising (a) a support body, (b) a coating comprising (i) a catalytically active, multimetal oxide which comprises molybdenum and at least one further metal and is of the general formula (I) Mo12BiaCrbX1cFedX2eX3fOy (I) where X1=Co and/or Ni, X2=Si and/or Al, X3=Li, Na, K, Cs and/or Rb, 0.2≦a≦1, 0≦b≦2, 2≦c≦10, 0.5≦d≦10, 0≦e≦10, 0≦f≦0.5 and y=a number which, with the prerequisite of charge neutrality, is determined by the valency and frequency of the elements in (I) other than oxygen, and (ii) at least one pore former.
Claims4
-5. (canceled)
A coated catalyst which is obtainable from a catalyst precursor comprising
- (a) a support body,
- (b) a coating comprising (i) a catalytically active, multimetal oxide which comprises molybdenum and at least one further metal and is of the general formula (I)
- Mo12BiaCrbX1cFedX2eX3fOy (I)
- where
- X1=Co and/or Ni,
- X2=Si and/or Al,
- X3=Li, Na, K, Cs and/or Rb,
- 0.2≦a≦1,
- 0≦b≦2,
- 2≦c≦10,
- 0.5≦d≦10,
- 0≦e≦10,
- 0≦f≦0.5 and
- y=a number which, with the prerequisite of charge neutrality, is determined by the valency and frequency of the elements in (I) other than oxygen, and (ii) at least one pore former.
The coated catalyst according to claim 1, wherein the coating comprising the catalytically active multimetal oxide (i) and the pore former (ii) additionally comprises (iii) a molybdenum oxide or a precursor compound, which forms molybdenum oxide.
A process for preparing the coated catalyst according to claim 1, in which a layer comprising (i) a catalytically active multimetal oxide comprising molybdenum and at least one further metal, and (ii) a pore former, are applied to a support body by means of a binder, and the coated support body is dried and calcined.
Dependencies are inferred from the claim text.