US4624938A
Expired / Lapsed
US
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Process for producing wide-pore catalyst supports
Assignee: Shell USA Inc
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Filing: 1985-04-26
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Granted: 1986-11-25
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Expires: 2005-04-26
Abstract
Abstract This invention relates to a process for preparing catalyst supports with a wide pore size distribution by simultaneously titrating an acid aluminum species and a basic aluminum species, and interacting the precipitate with a phosphorus-containing oxide during the aging step. The porous resulting alumina supports have surface areas above about 300 m 2 /g with a significant fraction of the pores having diameters greater than 350 Å and a significant fraction of the pores having diameters less than 70 Å.
Inventors
- 👤 Richard A. Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:14
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; B; B01; B01J; B01J27/00; B01J27/14; B01J35/00; B01J35/60; B01J37/00; B01J37/02; B01J37/03; B01J35/61; B01J35/615; B01J35/64; B01J35/647; B01J35/66
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
173 words
A process for the preparation of wide-pore alumina supports having surface areas above about 300 m 2 /g, at least about 20% of the pore volume located in pores greater than about 350 Å and at least about 20% of pores less than about 70 Å in diameter, a crush strength greater than about 10 lbs. and containing an amount of phosphorus in the range from about 0.1% to about 5.0% by weight, which process comprises: (a) concurrently titrating an acid aluminum salt in an aqueous solution with a basic aluminum compound in an aqueous solution, thereby forming a precipitate, (b) adding a phosphorus-containing compound to the precipitate and adjusting the pH to a range between about 9.0 and about 11.0, (c) aging the precipitate at the adjusted pH at a temperature in the range between about 20° C. and about 90° C. for at least 15 minutes, (d) washing the precipitate, (e) drying the precipitate, and (f) calcining the precipitate at a temperature ranging from about 300° C. to about 900° C.
Claim 2
Dependent Claim
173 words
A process for the preparation of wide-pore alumina supports having surface areas above about 300 m 2 /g, at least about 20% of the pore volume located in pores greater than about 350 Å and at least about 20% of pores less than about 70 Å in diameter, a crush strength greater than about 10 lbs. and containing an amount of phosphorus in the range from about 0.1% to about 5.0% by weight, which process comprises: (a) concurrently titrating an acid aluminum salt in an aqueous solution with a basic aluminum compound in an aqueous solution, thereby forming a precipitate, (b) adding a phosphorus-containing compound to the precipitate and adjusting the pH to a range between about 9.0 and about 11.0, (c) aging the precipitate at the adjusted pH at a temperature in the range between about 20° C. and about 90° C. for at least 15 minutes, (d) washing the precipitate, (e) drying the precipitate, and (f) calcining the precipitate at a temperature ranging from about 300° C. to about 900° C.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the amount of phosphorus in the final calcined support is in the range from about 1% to about 4% by weight.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the precipitation is carried out at a pH in the range between about 5.5 to about 10.0.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein the precipitation is carried out at a pH in the range between about 5.5 and about 8.0.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the precipitation is carried out at a temperature between about 20° C. and about 90° C.
Claim 7
Dependent Claim
22 words
The process of claim 5 wherein the precipitation is carried out at a temperature between about 50° C. and about 85° C.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein step (a) is carried out by concurrent titration.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein step (a) is carried out by sequential titration.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein the acid salt is selected from the group consisting of aluminum sulfate, nitrate or chloride, and the basic compound is an alkali metal aluminate.
Claim 11
Dependent Claim
23 words
The process of claim 1 wherein the phosphorus-containing compound is selected from the group consisting of phosphoric acid, ammonium phosphate and mixtures thereof.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the aging pH is in the range between about 9.5 and about 10.5.
Claim 13
Dependent Claim
17 words
The process of claim 1 wherein drying and calcining may be carried out in the same step.
Claim 14
Dependent Claim
195 words
A process for the preparation of wide-pore alumina supports having surface areas above about 300 m 2 /g, at least about 20% of the pore volume located in pores greater than about 350 Å and at least about 20% of pores less than about 70 Å, a crush strength greater than about 10 lbs. and containing an amount of phosphorus in the range from about 0.1% to about 5.0% by weight, which process comprises: (a) concurrently titrating an acid aluminum salt selected from the group consisting of aluminum sulfate, nitrate or chloride in an aqueous solution with an alkali metal aluminate in an aqueous solution, thereby forming a precipitate, (b) adding a phosphorus-containing compound selected from the group consisting of phosphoric acid, ammonium phosphate and mixtures thereof to the precipitate and adjusting the pH to a range between about 9.5 and about 10.5, (c) aging the precipitate at the adjusted pH at a temperature in the range between about 50° C. and about 85° C. for at least 15 minutes, (d) washing the precipitate, (e) drying the precipitate, and (f) calcining the precipitate at a temperature ranging from about 300° C. to about 900° C.
Claim 15
Dependent Claim
195 words
A process for the preparation of wide-pore alumina supports having surface areas above about 300 m 2 /g, at least about 20% of the pore volume located in pores greater than about 350 Å and at least about 20% of pores less than about 70 Å, a crush strength greater than about 10 lbs. and containing an amount of phosphorus in the range from about 0.1% to about 5.0% by weight, which process comprises: (a) concurrently titrating an acid aluminum salt selected from the group consisting of aluminum sulfate, nitrate or chloride in an aqueous solution with an alkali metal aluminate in an aqueous solution, thereby forming a precipitate, (b) adding a phosphorus-containing compound selected from the group consisting of phosphoric acid, ammonium phosphate and mixtures thereof to the precipitate and adjusting the pH to a range between about 9.5 and about 10.5, (c) aging the precipitate at the adjusted pH at a temperature in the range between about 50° C. and about 85° C. for at least 15 minutes, (d) washing the precipitate, (e) drying the precipitate, and (f) calcining the precipitate at a temperature ranging from about 300° C. to about 900° C.
Claim 16
Dependent Claim
23 words
The process of claim 13 wherein step (a) is carried out at a pH in the range between about 5.5 and about 8.0.
Claim 17
Dependent Claim
22 words
The process of claim 13 wherein step (a) is carried out at a temperature between about 50° C. and about 85° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |