US3856705A
Expired / Lapsed
US
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Aluminum borate catalyst compositions
Assignee: Union Oil Company of California
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Filing: 1972-11-16
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Granted: 1974-12-24
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Expires: 1992-11-16
Abstract
Abstract Certain crystalline aluminum borate catalyst supports containing about 8-25 weight-percent of B2O3 are found to provide unusually stable and active catalysts for high-temperature chemical conversions, particularly exhaust gas conversion, when prepared by precalcining shaped composites of alumina and boria at temperatures between about 1,250* and 2,600*F., prior to the addition thereto of active metal or metals. Calcination at below 1,250*F. is found to yield amorphous catalysts of inferior activity, while at temperatures above 2,600*F. drastic reductions in surface area may occur.
Inventors
- 👤 D Mcarthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/70; C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38; C01B3/40; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G45/00; C10G45/02; C10G45/04; B01J35/00; B01J35/50; B01J35/56; C01B2203/00; C01B2203/10; C01B2203/1041; C01B2203/1047; C01B2203/1052; C01B2203/1076; C07; C07C; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/745; C07C2523/75; C07C2523/755; C07C2527/00; C07C2527/02; C07C2527/04; C07C2527/043; C07C2529/00; C07C2529/86; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
91 words
A SHAPED, POROUS, COHESIVE AGGREGATE CONSISTING ESSENTIALLY OF CRYSTALLINE ALUMINUM BORATE HAVING A SURFACE AREA BETWEEN ABOUT 1 AND 150 M2/G AND A POROSITY OF AT LEAST ABOUT 0.1 ML/GRAM, AND WHEREIN THE WEIGHT-RATIO OF B2O3/AL2O3 IS BETWEEN ABOUT 8/92 AND 25/75, SAID AGGREGATE HAVING BEEN FORMED BY CALCINING A PRECURSOR, AT TEMPERATURES BETWEEN ABOUT BORIA, OR BORIA PRECURSOR, AT TEMPERATURES BETWEEN ABOUT 1,250* AND 2,600*F FOR A SUFFICIENT TIME TO PRODUCE SAID CRYSTALLINE ALUMINUM BORATE, SAID PRESHAPED COMPOSITE COMPRISING BETWEEN ABOUT 8% AND 40% BY DRY WEIGHT OF B2O3 EQUIVALENT.
Claim 2
Dependent Claim
91 words
A SHAPED, POROUS, COHESIVE AGGREGATE CONSISTING ESSENTIALLY OF CRYSTALLINE ALUMINUM BORATE HAVING A SURFACE AREA BETWEEN ABOUT 1 AND 150 M2/G AND A POROSITY OF AT LEAST ABOUT 0.1 ML/GRAM, AND WHEREIN THE WEIGHT-RATIO OF B2O3/AL2O3 IS BETWEEN ABOUT 8/92 AND 25/75, SAID AGGREGATE HAVING BEEN FORMED BY CALCINING A PRECURSOR, AT TEMPERATURES BETWEEN ABOUT BORIA, OR BORIA PRECURSOR, AT TEMPERATURES BETWEEN ABOUT 1,250* AND 2,600*F FOR A SUFFICIENT TIME TO PRODUCE SAID CRYSTALLINE ALUMINUM BORATE, SAID PRESHAPED COMPOSITE COMPRISING BETWEEN ABOUT 8% AND 40% BY DRY WEIGHT OF B2O3 EQUIVALENT.
Claim 3
Dependent Claim
19 words
A shaped aggregate as defined in claim 1 wherein the weight-ratio of B2O3/Al2O3 is between about 10/90 and 20/80.
Claim 4
Dependent Claim
21 words
A shaped aggregate as defined in claim 1, said aggregate having been calcined at temperatures between about 1,450* and 2, 300*F.
Claim 5
Dependent Claim
19 words
A shaped aggregate as defined in claim 3 wherein the weight-ratio of B2O3/Al2O3 is between about 10/90 and 20/80.
Claim 6
Dependent Claim
18 words
A shaped aggregate as defined in claim 1, having a surface area between about 5 and 150 m2/g.
Claim 7
Dependent Claim
19 words
A shaped aggregate as defined in claim 5 wherein the weight-ratio of B2O3/Al2O3 is between about 10/90 and 20/80.
Claim 8
Dependent Claim
21 words
A shaped aggregate as defined in claim 6, said aggregate having been calcined at temperatures between about 1,450* and 2, 300*F.
Claim 9
Dependent Claim
17 words
A shaped aggregate as defined in claim 1, in the form of 1/32 - 1/2 inch granules.
Claim 10
Dependent Claim
26 words
A shaped aggregate as defined in claim 1, in the form of a monolithic structure traversed by channels of about 1/32 - 1/4 inch in diameter.
Claim 11
Dependent Claim
32 words
A shaped aggregate as defined in claim 1, in the form of a membranous coating supported on an inert monolithic structure traversed by channels of about 1/32 - 1/4 inch in diameter.
Claim 12
Dependent Claim
17 words
A shaped aggregate as defined in claim 1 containing less than about 1 weight-percent of free B2O3.
Claim 13
Dependent Claim
17 words
A shaped aggregate as defined in claim 1 containing less than about 5 weight-percent of free Al2O3.
Claim 14
Dependent Claim
27 words
A shaped aggregate as defined in claim 1, having a surface area between about 5 and 150 m2/g and a porosity between about 0.2 and 0.8 ml/g.
Claim 15
Dependent Claim
56 words
A shaped aggregate as defined in claim 1, said aggregate containing a minor proportion of free B2O3 and having been leached with a reagent selected from the class consisting of hot water and aqueous ammonia, for a sufficient time to extract a substantial portion of said free B2O3 without essentially altering the shape of said aggregate.
Claim 16
Independent Claim
90 words
A method for the manufacture of a coated monolithic catalyst support, which comprises coating an inert monolithic structure traversed by channels of about 1/52 - 1/4 inch in diameter with a suspension of alumina in a glycerol solution of boric acid, and thereafter draining, drying and calcining the coated structure at a temperature between about 1,250* and 2,600*F, the proportions of alumina and boric acid in said suspension being adjusted to provide an aluminum borate coating on said monolith containing between about 8% and 40% by dry weight of B2O3.
Claim 17
Independent Claim
90 words
A method for the manufacture of a coated monolithic catalyst support, which comprises coating an inert monolithic structure traversed by channels of about 1/52 - 1/4 inch in diameter with a suspension of alumina in a glycerol solution of boric acid, and thereafter draining, drying and calcining the coated structure at a temperature between about 1,250* and 2,600*F, the proportions of alumina and boric acid in said suspension being adjusted to provide an aluminum borate coating on said monolith containing between about 8% and 40% by dry weight of B2O3.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |