Patent US4722920A successfully refreshed from Google Patents.
US4722920A
Expired / Lapsed
US
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Alumina catalyst supports
Assignee: Toyota Central R&D Labs Inc
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Filing: 1987-02-03
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Granted: 1988-02-02
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Expires: 2007-02-03
Abstract
Abstract An alumina catalyst support stable at high temperatures comprises transformative alumina having a purity not less than 99.95% impregnated with lanthanum in an amount of 1.5 to 6 wt % based on the weight of the alumina. The alumina catalyst support has a surface area of at least 60 m2/g after heating at 1200 DEG C. for 5 hours.
Inventors
- 👤 Mareo Kimura
- 👤 Masakuni Ozawa
- 👤 Akio Isogai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J21/00; B01J21/02; B01J21/04; B01J2235/00; B01J2235/15; B01J35/00; B01J35/30; B01J35/60; B01J35/61; B01J35/613; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
An alumina catalyst support stable at high temperatures which comprises transformative alumina having a purity of not less than 99.95% impregnated with lanthanum in an amount of 1.5 to 6 wt% based on the weight of the alumina, said alumina catalyst support having a surface area of at least 60 m 2 /g after heating at 1200° C. for 5 hours.
Claim 2
Dependent Claim
61 words
An alumina catalyst support stable at high temperatures which comprises transformative alumina having a purity of not less than 99.95% impregnated with lanthanum in an amount of 1.5 to 6 wt% based on the weight of the alumina, said alumina catalyst support having a surface area of at least 60 m 2 /g after heating at 1200° C. for 5 hours.
Claim 3
Dependent Claim
19 words
An alumina catalyst support according to claim 1, wherein said transformative alumina has a purity not less than 99.99%.
Claim 4
Dependent Claim
30 words
An alumina catalyst support according to claim 1, wherein said transformative alumina is at least one alumina selected from the group consisting of gamma-alumina, delta-alumina, eta-alumina, chi-alumina, theta-alumina and kappa-alumina.
Claim 5
Dependent Claim
21 words
An alumina catalyst support according to claim 1, wherein said transformative alumina has a particle size not more than 0.5 μm.
Claim 6
Dependent Claim
32 words
An alumina catalyst support according to claim 1, wherein said transformative alumina is impregnated with said lanthanum in an amount of 2.5 to 4.0 wt% based on the weight of the alumina.
Claim 7
Dependent Claim
20 words
An alumina catalyst support according to claim 1, wherein said support is in form of granules, pellets or a honeycomb.
Claim 8
Dependent Claim
54 words
A process for preparing an aluminum catalyst support having a surface area of least 60 m 2 /g after heating at 1200° C. for five hours, which comprises impregnating transformative alumina, having a purity of not less than 99.95%, with from 1.5 to 6 wt%, based on the weight of the alumina, of lanthanum.
Claim 9
Dependent Claim
54 words
A process for preparing an aluminum catalyst support having a surface area of least 60 m 2 /g after heating at 1200° C. for five hours, which comprises impregnating transformative alumina, having a purity of not less than 99.95%, with from 1.5 to 6 wt%, based on the weight of the alumina, of lanthanum.
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) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |