US4290919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracking catalysts passivated by tungsten
Assignee: Phillips Petroleum Co
•
Filing: 1979-07-23
•
Granted: 1981-09-22
•
Expires: 1999-07-23
Abstract
Abstract Metals such as nickel, vanadium and iron contaminating a cracking catalyst are passivated by contacting the cracking catalyst under elevated temperature conditions with tungsten and compounds of tungsten.
Inventors
- 👤 Dwight L. McKay
- 👤 Brent J. Bertus
- 👤 Harold W. Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:48
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20; B01J23/00; B01J23/16; B01J23/24; B01J23/30; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A modified cracking catalyst obtained by contacting a zeolite-modified silica-alumina cracking catalyst on which a deactivating amount of at least one metal selected from the group consisting of nickel, iron, and vanadium has been deposited and at least one passivating material selected from tungsten and compounds of tungsten under elevated temperature conditions in an amount such as to add about 0.05 to 2 weight percent tungsten based on the weight of the untreated catalyst.
Claim 2
Dependent Claim
74 words
A modified cracking catalyst obtained by contacting a zeolite-modified silica-alumina cracking catalyst on which a deactivating amount of at least one metal selected from the group consisting of nickel, iron, and vanadium has been deposited and at least one passivating material selected from tungsten and compounds of tungsten under elevated temperature conditions in an amount such as to add about 0.05 to 2 weight percent tungsten based on the weight of the untreated catalyst.
Claim 3
Dependent Claim
38 words
A catalyst in accordance with claim 1 obtained by contacting the cracking catalyst with the passivating material at temperatures in the range of about 800° F. (427° C.) to about 1500° F. (816° C.) and under reducing conditions.
Claim 4
Dependent Claim
36 words
A catalyst in accordance with claim 1 obtained by contacting the cracking catalyst with tungsten at temperatures in the range of about 800° F. (427° C.) to about 1500° F. (816° C.) and under reducing conditions.
Claim 5
Dependent Claim
20 words
A catalyst in accordance with claim 1 obtained by contacting said cracking catalyst with a tungsten salt of thiophosphoric acid.
Claim 6
Dependent Claim
13 words
A catalyst according to claim 4 wherein said tungsten salt is tungsten hexa(di-n-propylphosphorodithioate).
Claim 7
Dependent Claim
26 words
A modified cracking catalyst obtained by contacting a zeolite-modified silica-alumina cracking catalyst and at least one passivating compound containing tungsten and phosphorus, under elevated temperature conditions.
Claim 8
Dependent Claim
26 words
A modified cracking catalyst obtained by contacting a zeolite-modified silica-alumina cracking catalyst and at least one passivating compound containing tungsten and phosphorus, under elevated temperature conditions.
References Cited (Backward Citations)
CA556072A
Cited
GB515309A
Cited
US2396641A
Cited
US2850437A
Cited
US2865842A
Cited
US2849383A
Cited
US2921018A
Cited
US3340322A
Cited
US3365513A
Cited
US3711422A
Cited
US3821324A
Cited
US4031002A
Cited
US4146463A
Cited
US4217205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |