US3978004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for the treatment of gases containing various derivatives of sulphur
Assignee: Rhone Progil SA
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Filing: 1974-08-01
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Granted: 1976-08-31
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Expires: 1994-08-01
Abstract
Abstract Catalysts for Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sq.m./g and is composed of activated alumina and a compound of lanthanum, a lanthanide series metal of atomic number 58 to 71 or a metal of Group IIIB of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst.
Inventors
- 👤 Jean-Claude Daumas
- 👤 Georges Dupuy
- 👤 Max Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:00
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0434; B; B01; B01J; B01J23/00; B01J23/10; B01J35/00; B01J35/60; C01B17/0456; B01J35/61; B01J35/615; B01J35/63; B01J35/635
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A Claus reaction catalyst for treatment of industrial gases containing hydrogen sulphide and sulphurous anhydride in which the catalyst consists essentially of activated alumina as a support having a specific surface area of at least 80 sq.m./g and at least one oxide of a metal selected from the group consisting of yttrium, lanthanum, praseodymium, neodymium, samarium and gadolinium as the essential catalyst component present in an amount within the range of 1-20% by weight and which may contain in addition a small amount of an oxide of a metal selected from the group consisting of titanium, cobalt, nickel, iron and uranium.
Claim 2
Dependent Claim
101 words
A Claus reaction catalyst for treatment of industrial gases containing hydrogen sulphide and sulphurous anhydride in which the catalyst consists essentially of activated alumina as a support having a specific surface area of at least 80 sq.m./g and at least one oxide of a metal selected from the group consisting of yttrium, lanthanum, praseodymium, neodymium, samarium and gadolinium as the essential catalyst component present in an amount within the range of 1-20% by weight and which may contain in addition a small amount of an oxide of a metal selected from the group consisting of titanium, cobalt, nickel, iron and uranium.
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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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |