US4312787A
Expired / Lapsed
US
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Coated catalysts containing high loading of active phase, particularly useful in the preparation of maleic anhydride
Assignee: Standard Oil Co
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Filing: 1979-12-17
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Granted: 1982-01-26
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Expires: 1999-12-17
Abstract
Abstract Catalysts particularly effective in the oxidation of n-butane, n-butenes, 1,3 butadiene and mixtures thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce maleic anhydride are provided which comprise an essentially inert, at least partially porous support to which is adhered on its outer surface, catalytically active mixed oxides of vanadium and phosphorus or of vanadium, phosphorus and uranium in an amount greater than 50% to about 80% by weight of the combined support and active oxide.
Inventors
- 👤 Serge R. Dolhyj
- 👤 Marc A. Pepera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:10
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
120 words
A catalyst comprising an essentially inert, at least partially porous support of at least about 20 microns in diameter, said support having an outer surface, and a catalytically active oxide material coating on said outer surface of said support which strongly adheres to said outer surface of said support wherein said oxide material consists essentially of the mixed oxides of vanadium and phosphorus, present in an amount greater than 50% to about 80% by weight of the combined support and oxide material wherein said oxide material is applied to said outer surface of said support by partially wetting said support with a liquid, contacting the partially wet support with a powder of said oxide material, and effecting said oxide coating.
Claim 2
Dependent Claim
120 words
A catalyst comprising an essentially inert, at least partially porous support of at least about 20 microns in diameter, said support having an outer surface, and a catalytically active oxide material coating on said outer surface of said support which strongly adheres to said outer surface of said support wherein said oxide material consists essentially of the mixed oxides of vanadium and phosphorus, present in an amount greater than 50% to about 80% by weight of the combined support and oxide material wherein said oxide material is applied to said outer surface of said support by partially wetting said support with a liquid, contacting the partially wet support with a powder of said oxide material, and effecting said oxide coating.
Claim 3
Dependent Claim
43 words
A catalyst as described in claim 1, wherein said catalytically active oxide material is represented by the empirical formula V.sub.1 P.sub.a O.sub.x wherein a=0.1 to 10 and x is the number of oxygens required to satisfy the valence requirements of the other elements.
Claim 4
Dependent Claim
26 words
A catalyst as described in claim 1 wherein said support is selected from the group consisting of silica, alumina, alumina-silica, Alundum, silicon carbide, titania and zirconia.
Claim 5
Dependent Claim
33 words
A catalyst as described in claim 1 wherein said catalytically active oxide material is present in an amount from about 55% to about 70% by weight of the combined support and oxide material.
Claim 6
Dependent Claim
29 words
A catalyst as in claim 1 wherein said catalytically active oxide material is present in an amount of about 55% by weight of the combined support and oxide material.
Claim 7
Dependent Claim
30 words
A catalyst as described in claim 1 wherein said catalytically active oxide material is present in an amount of about 70% by weight of the combined support and oxide material.
Claim 8
Dependent Claim
40 words
A catalyst as described in claim 1, wherein the catalytically active oxide material is represented by the formula V.sub.1 P.sub.1.16 O.sub.x wherein x is the number of atoms of oxygen required to satisfy the valence requirements of the other elements.
Claim 9
Dependent Claim
122 words
A catalyst comprising an essentially inert, at least partially porous support of at least about 20 microns in diameter, said support having an outer surface, and a catalytically active oxide material coating on said outer surface of said support which strongly adheres to said outer surface of said support wherein said oxide material consists essentially of the mixed oxides of vanadium and phosphorus and uranium, present in an amount greater than 50% to about 80% by weight of the combined support and oxide material wherein said oxide material is applied to said outer surface of said support by partially wetting said support with a liquid, contacting the partially wet support with a powder of said oxide material, and effecting said oxide coating.
Claim 10
Dependent Claim
122 words
A catalyst comprising an essentially inert, at least partially porous support of at least about 20 microns in diameter, said support having an outer surface, and a catalytically active oxide material coating on said outer surface of said support which strongly adheres to said outer surface of said support wherein said oxide material consists essentially of the mixed oxides of vanadium and phosphorus and uranium, present in an amount greater than 50% to about 80% by weight of the combined support and oxide material wherein said oxide material is applied to said outer surface of said support by partially wetting said support with a liquid, contacting the partially wet support with a powder of said oxide material, and effecting said oxide coating.
Claim 11
Dependent Claim
54 words
A catalyst as described in claim 8, wherein said catalytically active oxide material is represented by the empirical formula V.sub.a P.sub.b U.sub.c O.sub.x wherein a and b are 0.1 to 10; c is 0.01 to 5; and x is the number of oxygens required to satisfy the valence requirements of the other elements present.
Claim 12
Dependent Claim
26 words
A catalyst as described in claim 8 wherein said support is selected from the group consisting of silica, alumina, alumina-silica, Alundum, silicon carbide, titania and zirconia.
Claim 13
Dependent Claim
33 words
A catalyst as described in claim 8 wherein said catalytically active oxide material is present in an amount from about 55% to about 70% by weight of the combined support and oxide material.
Claim 14
Dependent Claim
29 words
A catalyst as in claim 8 wherein said catalytically active oxide material is present in an amount of about 55% by weight of the combined support and oxide material.
Claim 15
Dependent Claim
30 words
A catalyst as described in claim 8 wherein said catalytically active oxide material is present in an amount of about 70% by weight of the combined support and oxide material.
Claim 16
Dependent Claim
54 words
A catalyst as described in claim 8, wherein said catalytically active oxide material is represented by the empirical formula V.sub.a P.sub.b U.sub.c O.sub.x wherein a and b are 0.5 to 3; c is 0.1 to 0.5; and x is the number of oxygens required to satisfy the valence requirements of the other elements present.
Claim 17
Dependent Claim
29 words
The catalyst as described in claim 8, wherein said catalytically active oxide material is represented by the formula V 1 P 1 .2 U 0 .2 O x .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |