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Patent US4171290A successfully refreshed from Google Patents.
US4171290A
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Catalyst for selective hydrocracking of alkylbenzenes
Assignee: BP Corp North America Inc
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Filing: 1978-04-24
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Granted: 1979-10-16
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Expires: 1998-04-24
Abstract
Abstract Catalyst composition comprising highly purified alumina containing essentially no silica with a surface area of at least 100 m 2 /g and up to 5% rhodium and up to 10% zinc.
Inventors
- 👤 Rodney L. Mieville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:38
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/60; C; C10; C10G; C10G2400/00; C10G2400/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
A catalyst composition comprising highly purified alumina containing essentially no silica with a surface area of at least 100 m 2 /g, up to 5 wt. percent rhodium zinc oxide wherein, up to 10 wt. percent zinc is present, expressed as the metal, and wherein the said alumina comprises at least one member selected from the group consisting of gamma alumina and eta alumina.
Claim 2
Dependent Claim
64 words
A catalyst composition comprising highly purified alumina containing essentially no silica with a surface area of at least 100 m 2 /g, up to 5 wt. percent rhodium zinc oxide wherein, up to 10 wt. percent zinc is present, expressed as the metal, and wherein the said alumina comprises at least one member selected from the group consisting of gamma alumina and eta alumina.
Claim 3
Dependent Claim
66 words
The catalyst composition of claim 1 wherein the said rhodium is present in an amount within the range of from about 0.1 to 5 wt. percent, based upon the weight of said catalyst composition and said zinc oxide is present in an amount within the range of from about 0.1 to 10 wt. percent expressed as the metal and based upon the weight of said composition.
Claim 4
Dependent Claim
13 words
The catalyst composition of claim 1 wherein the said alumina is gamma alumina.
Claim 5
Dependent Claim
24 words
The catalyst composition of claim 1 wherein the said rhodium is selected from the group consisting of the metal, the oxide and mixtures thereof.
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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |