US4490479A
Expired / Lapsed
US
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Process for preparing catalysts
Assignee: Chevron USA Inc
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Filing: 1983-05-19
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Granted: 1984-12-25
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Expires: 2003-05-19
Abstract
Abstract A process for preparing novel catalysts of increased activity which comprises (1) mixing alumina with at least one metal compound selected from the group consisting of Group IVB metal compounds and compounds of vanadium, chromium, manganese, tungsten, nickel and cobalt and an aqueous solution containing at least one dissolved compound therein that imparts to said aqueous solution a pH below 6 and (2) thereafter adding to the resulting product at least one metal compound not previously added thereto.
Inventors
- 👤 Roger F. Vogel
- 👤 Raymond J. Rennard
- 👤 Joseph A. Tabacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:21
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/883; B01J23/16; B01J23/20; B01J23/22; B01J37/00; B01J37/02; B01J37/0201; B01J37/0207; C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; B01J21/00; B01J21/06; B01J21/063; B01J21/066
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
168 words
A process for preparing catalysts of increased activity which comprises in a first stage (1) in a first stage mixing alumina with at least one metal compound selected from the group consisting of TiO 2 , TiO 2 .xH 2 O, Ti 2 O 3 , ZrO 2 , ZrO 2 .xH 2 O and WO 3 and an aqueous solution containing at least one dissolved compound therein that imparts to said aqueous solution a pH below 6 so as to place said metal compound on the surface of said alumina, the resultant product containing from 20 to 60 weight percent alumina, 0.5 to 10 weight percent of said metal compound, 30 to 75 weight percent water and 0.01 to 2 weight percent of said dissolved compound, drying the resultant product and (2) thereafter in a second stage adding to the resultant product a molybdenum compound selected from the group consisting of molybdenum oxide or a molybdenum compound capable of being converted to its oxide form during calcination.
Claim 2
Dependent Claim
168 words
A process for preparing catalysts of increased activity which comprises in a first stage (1) in a first stage mixing alumina with at least one metal compound selected from the group consisting of TiO 2 , TiO 2 .xH 2 O, Ti 2 O 3 , ZrO 2 , ZrO 2 .xH 2 O and WO 3 and an aqueous solution containing at least one dissolved compound therein that imparts to said aqueous solution a pH below 6 so as to place said metal compound on the surface of said alumina, the resultant product containing from 20 to 60 weight percent alumina, 0.5 to 10 weight percent of said metal compound, 30 to 75 weight percent water and 0.01 to 2 weight percent of said dissolved compound, drying the resultant product and (2) thereafter in a second stage adding to the resultant product a molybdenum compound selected from the group consisting of molybdenum oxide or a molybdenum compound capable of being converted to its oxide form during calcination.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the pH of said aqueous solution is in the range of about 0.1 to about 5.5.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the pH of said aqueous solution is in the range of about 1.0 to about 5.0.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said dissolved compound is an inorganic acid.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said inorganic acid is nitric acid.
Claim 7
Dependent Claim
12 words
The process of claim 4 wherein said inorganic acid is hydrochloric acid.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein said metal compound is a titanium compound.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein said metal compound is a zirconium compound.
Claim 10
Dependent Claim
29 words
The process of claim 1 wherein the components used fall within the following ranges: ______________________________________
Weight Percent
______________________________________
Alumina 25-45
Metallic Component(s)
1-5
Water 50-70
Acidic Component(s)
0.1-0.7
______________________________________
Claim 11
Dependent Claim
29 words
The process of claim 1 wherein the product from the first stage is dried and then calcined in air at a temperature of about 200° to about 1200° C.
Claim 12
Dependent Claim
29 words
The process of claim 1 wherein the product from the first stage is dried and then calcined in air at a temperature of about 300° to about 800° C.
Claim 13
Dependent Claim
32 words
The process of claim 1 wherein the product at the end of the second stage is dried and then calcined in air at a temperature of about 200° to about 1200° C.
Claim 14
Dependent Claim
32 words
The process of claim 1 wherein the product at the end of the second stage is dried and then calcined in air at a temperature of about 300° to about 800° C.
Claim 15
Dependent Claim
66 words
The process of claim 1 wherein a titanium compound is added in the first stage, the resulting product is dried and then calcined in air at a temperature of about 200° to about 1200° C., a molybdenum compound and a nickel compound are added to the calcined product, followed by further drying and calcining in air at a temperature of about 200° to about 1200° C.
References Cited (Backward Citations)
US2773846A
Cited
US2739132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |