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US4784981A
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Vanadium/phosphorus mixed oxide catalyst, process for its preparaton and its use
Assignee: Bayer AG
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Filing: 1982-07-19
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Granted: 1988-11-15
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Expires: 2002-07-19
Abstract
Abstract The invention relates to a vanadium/phosphorus mixed oxide catalyst, a process for its preparation and its use for the preparation of maleic anhydride. The catalyst according to the invention is prepared by reacting a vanadium(V) compound with phosphoric acid and/or a compound forming phosphoric acid with heating, optionally in the presence of water, and subsequently treating the product obtained after the reaction with organic solvents and/or diluents having reducing activity, optionally in the presence of a promoter, at an elevated temperature.
Inventors
- 👤 Heinz-Jurgen Alpers
- 👤 Karl-Heinz Heller
- 👤 Gunther Lenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:43
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J23/00; B01J23/002; B01J23/16; B01J23/20; B01J23/22; 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: 32
Claim 1
Independent Claim
146 words
A process for the preparation of vanadium phosphorus mixed oxide-containing catalysts comprising (a) introducing a pentavalent vanadium compound and a pentavalent phosphorus compound into an aqueous medium wherein the aqueous medium is free from agents which would substantially reduce the pentavalent vanadium compound; (b) forming a substantially pentavalent catalyst precursor in the aqueous medium; (c) recovering the pentavalent catalyst percursor from the aqueous medium; (d) introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4; (e) effecting reduction of the vanadium; (f) recovering the resulting partially reduced catalyst precursor from the organic liquid medium; (g) calcining the partially reduced catalyst precursor, which further comprises introducing a promoter element-containing compound into the aqueous medium, or into the organic liquid medium prior or subsequent to the reduction of the vanadium.
Claim 2
Dependent Claim
146 words
A process for the preparation of vanadium phosphorus mixed oxide-containing catalysts comprising (a) introducing a pentavalent vanadium compound and a pentavalent phosphorus compound into an aqueous medium wherein the aqueous medium is free from agents which would substantially reduce the pentavalent vanadium compound; (b) forming a substantially pentavalent catalyst precursor in the aqueous medium; (c) recovering the pentavalent catalyst percursor from the aqueous medium; (d) introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4; (e) effecting reduction of the vanadium; (f) recovering the resulting partially reduced catalyst precursor from the organic liquid medium; (g) calcining the partially reduced catalyst precursor, which further comprises introducing a promoter element-containing compound into the aqueous medium, or into the organic liquid medium prior or subsequent to the reduction of the vanadium.
Claim 3
Dependent Claim
18 words
A process as in claim 1 wherein said organic liquid is selected from alcohols, ketones and mixtures thereof.
Claim 4
Dependent Claim
16 words
A process as in claim 2 wherein said organic liquid is selected from isopropanol and isobutanol.
Claim 5
Dependent Claim
13 words
A process as in claim 2 wherein said organic liquid comprises an alcohol.
Claim 6
Dependent Claim
11 words
A process as in claim 4 wherein said alcohol comprises isobutanol.
Claim 7
Dependent Claim
12 words
A process as in claim 1 wherein reduction is effected by heating.
Claim 8
Dependent Claim
23 words
A process as in claim 1 wherein said promoter element is selected from Mn, Co, Fe, Zn, Ni, Cu, Cd or mixtures thereof.
Claim 9
Dependent Claim
20 words
A process as in claim 1 wherein said promoter element is selected from the group consisting of platinum and palladium.
Claim 10
Dependent Claim
31 words
A process according to claim 1, wherein said organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4 is an aldehyde.
Claim 11
Dependent Claim
30 words
A process according to claim 1, wherein said organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4 is sec-butanol.
Claim 12
Dependent Claim
32 words
A process according to claim 1, wherein said organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4 is an unsaturated alcohol.
Claim 13
Dependent Claim
24 words
A process according to claim 1, wherein said pentavalent phosphorus compound is selected from the group consisting of pentoxide, polyphosphoric acid and pyrophosphoric acid.
Claim 14
Dependent Claim
30 words
A process according to claim 1, wherein the resultant partially reduced catalyst is disposed on a catalyst support selected from the group consisting of alumina, silica, titania and silicon carbide.
Claim 15
Dependent Claim
23 words
A process according to claim 1, wherein drying in step (g) occurs by evaporation and the vanadium/phosphorus atomic ratio is 1:0.9 to 1.5.
Claim 16
Dependent Claim
30 words
A process according to claim 1, wherein in step (a) the vanadium compound and the pentavalent phosphorus compound are heated to 80° to 180° C. for 1 to 24 hours.
Claim 17
Dependent Claim
25 words
A process according to claim 1, wherein in step (f) the precursor is recovered by filtration and the vanadium/phosphorus atomic ratio is 1:0.9 to 1:30.
Claim 18
Dependent Claim
27 words
A process according to claim 1, wherein the organic liquid is employed in an amount of 0.5 to 20 parts by weight, relative to the catalyst precursor.
Claim 19
Dependent Claim
20 words
A process according to claim 1, wherein the atomic ratio of the promoter to the vanadium is 0.01 to 0.1.
Claim 20
Dependent Claim
116 words
An oxidation catalyst comprising mixed oxides of vanadium and phosphorus prepared by (a) introducing a pentavalent vanadium compound and a pentavalent phosphorus compound into an aqueous medium wherein the aqueous medium is free from agents which would substantially reduce the pentavalent vanadium compound; (b) forming a substantially pentavalent catalyst precursor in the aqueous medium; (c) recovering the pentavalent catalyst precursor from the aqueous medium; (d) introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4, the catalyst additionally containing a promoter element selected from the group consisting of Mn, Co, Fe, Zn, Ni, Cu, Cd or mixtures thereof.
Claim 21
Dependent Claim
116 words
An oxidation catalyst comprising mixed oxides of vanadium and phosphorus prepared by (a) introducing a pentavalent vanadium compound and a pentavalent phosphorus compound into an aqueous medium wherein the aqueous medium is free from agents which would substantially reduce the pentavalent vanadium compound; (b) forming a substantially pentavalent catalyst precursor in the aqueous medium; (c) recovering the pentavalent catalyst precursor from the aqueous medium; (d) introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4, the catalyst additionally containing a promoter element selected from the group consisting of Mn, Co, Fe, Zn, Ni, Cu, Cd or mixtures thereof.
Claim 22
Dependent Claim
21 words
An oxidation catalyst as in claim 19 additionally containing a promoter element selected from the group consisting of platinum and palladium.
Claim 23
Dependent Claim
32 words
An oxidation catalyst according to claim 19, wherein said organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4 is an aldehyde.
Claim 24
Dependent Claim
31 words
An oxidation catalyst according to claim 19, wherein said organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4 is sec-butanol.
Claim 25
Dependent Claim
33 words
An oxidation catalyst according to claim 19, wherein said organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4 is an unsaturated alcohol.
Claim 26
Dependent Claim
26 words
An oxidation catalyst according to claim 19, wherein said pentavalent phosphorus compound is selected from the group consisting of phosphorus pentoxide, polyphosphoirc acid and pyrophosphoric acid.
Claim 27
Dependent Claim
31 words
An oxidation catalyst according to claim 19, wherein the resultant partially reduced catalyst is disposed on a catalyst support selected from the group consisting of alumina, silica, titania and silicon carbide.
Claim 28
Dependent Claim
23 words
An oxidation catalyst according to claim 19, wherein drying step (g) occurs by evaporation and the vanadium/phosphorus atomic ratio is 1:0.9 to 1.5.
Claim 29
Dependent Claim
31 words
An oxidation catalyst according to claim 19, wherein in step (a) the vanadium compound and the pentavalent phosphorus compound are heated to 80° to 180° C. for 1 to 24 hours.
Claim 30
Dependent Claim
26 words
An oxidation catalyst according to claim 19, wherein in step (f) the precursor is recovered by filtration and the vanadium/phosphorus atomic ratio is 1:0.9 to 1:30.
Claim 31
Dependent Claim
28 words
An oxidation catalyst according to claim 19, wherein the organic liquid is employed in an amount of 0.5 to 20 parts by weight, relative to the catalyst precursor.
Claim 32
Dependent Claim
21 words
An oxidation catalyst according to claim 19, wherein the atomic ratio of the promoter to the vanadium is 0.01 to 0.1.
References Cited (Backward Citations)
US4016105A
Cited
US4116868A
Cited
US4052417A
Cited
US4222945A
Cited
US4171316A
Cited
US4225465A
Cited
EP0031696A1
Cited
US4293498A
Cited
US4360453A
Cited
US4396535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |