US4552856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolite catalyst and preparation thereof
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-11-10
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Granted: 1985-11-12
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Expires: 2003-11-10
Abstract
Abstract A catalyst which exhibits superior activity maintenance in dehydrocyclization reactions are defined as a type L zeolite having exchangeable cations of which at least 75% are selected from Group IA and calcium and barium cations and containing well dispersed particles of at least one Group VII noble metal the preparation of which involves contacting the zeolite substantially free of moisture with a solution of the noble metal.
Inventors
- 👤 Samuel J. Tauster
- 👤 David E. W. Vaughan
- 👤 John J. Steger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/60; B01J29/61; B01J29/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
A process for preparing a catalyst which comprises substantially eliminating moisture from a zeolite L by heating the zeolite, contacting the heated zeolite L with a solution containing at least one Group VIII noble metal, separating a noble metal loaded zeolite from the solution and, calcining the loaded zeolite L at a temperature less than about 400° C.
Claim 2
Dependent Claim
58 words
A process for preparing a catalyst which comprises substantially eliminating moisture from a zeolite L by heating the zeolite, contacting the heated zeolite L with a solution containing at least one Group VIII noble metal, separating a noble metal loaded zeolite from the solution and, calcining the loaded zeolite L at a temperature less than about 400° C.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the zeolite L is immersed in the noble metal solution for less than about 2 minutes.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the noble metal is platinum.
Claim 5
Dependent Claim
20 words
The process of claim 2 wherein the zeolite has an average crystal size of no greater than about 0.2 microns.
Claim 6
Dependent Claim
24 words
The process of claim 2 wherein the solution concentration ranges from about 7 to 20 mg equivalent of noble metal per cc of solution.
Claim 7
Dependent Claim
82 words
A process for preparing a reforming catalyst which comprises substantially eliminating the moisture from a zeolite L by heating the zeolite from about 70° to 200° C., contacting the heated zeolite with a solution containing from about 7 to 20 mg equivalent per ml. of at least one Group VIII noble metal for a period of less than about 2 minutes, separating a metal loaded zeolite from the solution and, calcining the loaded zeolite at a temperature less than about 400° C.
Claim 8
Dependent Claim
82 words
A process for preparing a reforming catalyst which comprises substantially eliminating the moisture from a zeolite L by heating the zeolite from about 70° to 200° C., contacting the heated zeolite with a solution containing from about 7 to 20 mg equivalent per ml. of at least one Group VIII noble metal for a period of less than about 2 minutes, separating a metal loaded zeolite from the solution and, calcining the loaded zeolite at a temperature less than about 400° C.
Claim 9
Dependent Claim
11 words
The process of claim 6 wherein the noble metal is platinum.
Claim 10
Dependent Claim
20 words
The process of claim 7 wherein the average crystal size of the zeolite is no greater than about 0.2 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |