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US 6,642,174 B2Granted
Mixed-metal oxide catalysts and processes for preparing the same
AssigneeRohm and Haas Company
InventorsAnne Mae Gaffney, Ruozhi Song
Life of this patent
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Abstract
An improved catalyst comprising a mixed metal oxide is prepared by the use of a sol-gel technique. The catalyst is useful for the conversion of an alkane, or a mixture of an alkane and an alkene, to an unsaturated carboxylic acid by vapor phase oxidation, or to an unsaturated nitrile by vapor phase oxidation in the presence of ammonia.
Claims7
A process for the preparation of an improved catalyst comprising a mixed-metal oxide having the empirical formula
- MoaVbEcXdOe
- wherein E is at least one element selected from the group consisting of Te and Sb,
- wherein X is at least one element selected from the group consisting of Nb, Ta, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Ag, B, In, Ce and W, and
- wherein, when a=1, b=0.01 to 1.0, c=0.01 to 1.0, d=0.01 to 1.0 and e is dependent on the oxidation state of the other elements,
- said process comprising:
- (a) admixing compounds of Mo, V, E and X and at least one solvent to form a gel;
- (b) aging said so-formed gel;
- and
- (c) calcining said gel.
6 more elements
An improved catalyst comprising a mixed-metal oxide having the empirical formula
- MoaVbEcXdOe
- wherein E is at least one element selected from the group consisting of Te and Sb,
- wherein X is at least one element selected from the group consisting of Nb, Ta, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Ag, B, In, Ce and W, and
- wherein, when a=1, b=0.01 to 1.0, c=0.01 to 1.0, d=0.01 to 1.0 and e is dependent on the oxidation state of the other elements,
- said improved catalyst being produced by a process comprising:
- (a) admixing compounds of Mo, V, E and X and at least one solvent to form a gel;
- (b) aging said so-formed gel;
- and
- (c) calcining said gel.
6 more elements
Dependencies are inferred from the claim text.