Patent US2707874A successfully refreshed from Google Patents.
US2981694A
Expired / Lapsed
US
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Regeneration of supported platinum catalysts
Assignee: Shell USA Inc
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Filing: 1955-09-19
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Granted: 1961-04-25
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Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Engel Willem Frederik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:45
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/085; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/90; B01J23/96; B01J27/00; B01J27/06; B01J27/128; B01J27/13; B01J37/00; B01J37/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD FOR THE REGENERATION OF A CATALYST COMPRISING PLATINUM ON A SUPPORT CONTAINING AT LEAST A MAJOR AMOUNT OF ALUMINA DEACTIVATED THROUGH USE IN THE CONVERSION OF A CARBONACEOUS REACTANT AND CONTAINING CARBONACEOUS DEPOSITS WHICH COMPRISES, REMOVING AT LEAST A PORTION OF THE CARBONACEOUS DEPOSITS AT A TEMPERATURE BELOW 550*C., THEN TREATING THE CATALYST WITH A GASEOUS MIXTURE OF AN OXYGEN-CONTAINING GAS, STEAM, AND HYDROGEN CHLORIDE, THE MOLAR RATIO OF STEAM TO HYDROGEN CHLORIDE IN SAID GAS MIXTURE BEING FROM 100 TO 2000 AND THE MOLAR RATIO OF OXYGEN TO HYDROGEN CHLORIDE BEING FROM ABOUT 1 TO 100, SAID TREATMENT BEING CARRIED OUT AT A TEMPERATURE BETWEEN ABOUT 250 AND 550*C. FOR A TIME OF AT LEAST ONE HOUR.
Claim 2
Independent Claim
120 words
THE METHOD FOR THE REGENERATION OF A CATALYST COMPRISING PLATINUM ON A SUPPORT CONTAINING AT LEAST A MAJOR AMOUNT OF ALUMINA DEACTIVATED THROUGH USE IN THE CONVERSION OF A CARBONACEOUS REACTANT AND CONTAINING CARBONACEOUS DEPOSITS WHICH COMPRISES, REMOVING AT LEAST A PORTION OF THE CARBONACEOUS DEPOSITS AT A TEMPERATURE BELOW 550*C., THEN TREATING THE CATALYST WITH A GASEOUS MIXTURE OF AN OXYGEN-CONTAINING GAS, STEAM, AND HYDROGEN CHLORIDE, THE MOLAR RATIO OF STEAM TO HYDROGEN CHLORIDE IN SAID GAS MIXTURE BEING FROM 100 TO 2000 AND THE MOLAR RATIO OF OXYGEN TO HYDROGEN CHLORIDE BEING FROM ABOUT 1 TO 100, SAID TREATMENT BEING CARRIED OUT AT A TEMPERATURE BETWEEN ABOUT 250 AND 550*C. FOR A TIME OF AT LEAST ONE HOUR.
References Cited (Backward Citations)
US1678627A
Cited
US2246900A
Cited
US2546031A
Cited
US2642384A
Cited
US2752289A
Cited
US2785138A
Cited
US2785139A
Cited
US2916440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |