US4522708A
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Catalytic reforming process employing reforming catalysts which are based on tungsten and molybdenum carbides
Assignee: Eruotungstene-Poudres
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Filing: 1984-03-15
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Granted: 1985-06-11
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Expires: 2004-03-15
Abstract
Abstract The present invention relates to catalysts for reforming petroleum products in mass form or supported for example, on aluminium or active carbon, the active part of which consists of tungsten and molybdenum carbides corresponding to the general formula: (Mox W.sub.1-x)y Cz wherein 0<x<1 1≦y≦2 0.8≦z≦1 Nitridation prior to their use in a mixture H 2 +N 2 substantially increases the activity and selectivity thereof. These catalysts are not very sensitive to contamination by sulphur products.
Inventors
- 👤 Lucien Leclercq
- 👤 Marcelle Provost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/20; B01J27/22; C; C10; C10G; C10G35/00; C10G35/04; C10G35/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
In a process for reforming petroleum products by the catalysis of dehydrocyclization, isomerization, hydrogenolysis and dehydrogenation reactions, the improvement wherein the catalysts employed comprise a carbide corresponding to the formula: (Mo x W 1-x ) y C Z wherein o<x<1, 1≦y≦2 and 0.8≦z≦1, and said catalysts are initially nitrided at about 1,023 K. in a mixture of N 2 and H 2 before use.
Claim 2
Dependent Claim
64 words
In a process for reforming petroleum products by the catalysis of dehydrocyclization, isomerization, hydrogenolysis and dehydrogenation reactions, the improvement wherein the catalysts employed comprise a carbide corresponding to the formula: (Mo x W 1-x ) y C Z wherein o<x<1, 1≦y≦2 and 0.8≦z≦1, and said catalysts are initially nitrided at about 1,023 K. in a mixture of N 2 and H 2 before use.
Claim 3
Dependent Claim
18 words
The process according to claim 1, wherein said catalysts contain up to 0.5%, by weight, of free C.
Claim 4
Dependent Claim
28 words
The process according to claim 1, wherein said catalysts are in bulk form, in the form of powder having a granulometry of less than 5 um (Fisher test).
Claim 5
Dependent Claim
16 words
The process according to claim 1, wherein said catalysts are supported on active carbon or alumina.
Claim 6
Dependent Claim
17 words
A process according to claim 1, wherein said mixture of N 2 and H 2 is equimolecular.
Claim 7
Dependent Claim
8 words
The process according to claim 1, wherein 0.15≦x≦0.70.
References Cited (Backward Citations)
US2755228A
Cited
US3865750A
Cited
US4330332A
Cited
US4300952A
Cited
US4325843A
Cited
US4414182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |