Mixed oxide catalysts for the catalytic gas-phase oxidation of olefins and processes for producing them
AssigneeEvonik Degussa GmbH
InventorsAchim Fischer, Werner Burkhardt, Christoph Weckbecker, Klaus Huthmacher, Frank Wilz
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Abstract
The invention relates to mixed oxide catalysts for the catalytic gas-phase oxidation of olefins and methylated aromatics, processes for producing the catalysts and the reaction with air or oxygen in the presence of inert gases in various ratios at elevated temperatures and pressure to form aldehydes and carboxylic acids.
Claims30
A mixed oxide catalyst of the formula
- (Mo12BiaCb(Co+Ni)cDdEeFfGgHh)Ox (I)
- in which
- C:
- iron,
- D:
- at least one of the elements selected from the group consisting of W and P,
- E:
- at least one of the elements selected from the groups consisting of Li, K, Na, Rb, Cs, Mg, Ca, Ba and Sr,
- F:
- at least one of the elements selected from Ce, Mn, Cr and V
- G:
- at least one of the elements selected from the groups consisting of Nb, Se, Te, Sm, Gd, La, Y, Pd, Pt, Ru, Ag and Au
- H:
- at least one of the elements selected from the groups consisting of Si, Al, Ti and Zr
- and
- a=0-5.0
- b=0.5-5.0
- c=2-15
- d=0.01-5.0
- e=0.001-2
- f=0.001-5
- g=0-1.5
- h=0-800,
- and
- x=number which is determined by the valency and frequency of the elements other than oxygen, and g+h>0.
Process for preparing aldehydes and acids by oxidizing olefins or methylated aromatics with air or oxygen in the presence of inert gases, steam or offgases from the reaction at elevated temperatures, characterized in that a catalyst of the general formula
- (Mo12BiaCb(Co+Ni)cDdEeFfGGHh)Ox (I) is used,
- in which
- C:
- iron,
- D:
- at least one of the elements selected from the groups consisting of W and P,
- E:
- at least one of the elements selected from the groups consisting of Li, K, Na, Rb, Cs, Mg, Ca, Ba and Sr,
- F:
- at least one of the elements selected from the groups consisting of Ce, Mn, Cr and V
- G:
- at least one of the elements selected from the groups consisting of Nb, Se, Te, Sm, Gd, La, Y, Pd, Pt, Ru, Ag and Au
- H:
- at least one of the elements selected from the groups consisting of Si, Al, Ti and Zr
- and
- a=0-5.0
- b=0.5-5.0
- c=2-15
- d=0.01-5.0
- e=0.001-2
- f=0.001-5
- g=0-1.5
- h=0-800,
- and
- x=number which is determined by the valency and frequency of the elements other than oxygen, and g+h>0.
Dependencies are inferred from the claim text.