US3922337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-12-19
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Granted: 1975-11-25
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Expires: 1992-12-19
Abstract
Abstract Although low-temperature carbon monoxide shift catalysts containing copper and zinc oxide and possibly other oxides have been used industrially for some years, their use has given difficulties due to unexplained losses of activity. It has now been found that such loss of activity can be prevented by use of a guard material more basic than zinc oxide, such as alkalised alumina, or preferably by using a catalyst bed in two parts, the inlet part of which contains alkali above the limit normally acceptable for low temperature shift catalysts.
Inventors
- 👤 John Stewart Campbell
- 👤 Patrick Craven
- 👤 Phineas Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:46
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/06; C01B3/12; C01B3/16; C10; C10K; C10K3/00; C10K3/02; C10K3/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
IN A PROCESS FOR PRODUCING HYDROGEN WHICH COMPRISES CONTACTING CARBON MONOXIDE WITH STEAM OVER A COPPER-CONTAINING/LOW TEMPERATURE SHIFT CATALYST WHICH INCLUDES COPPER AND ZINC OXIDE, THE IMPROVEMENT WHEREBY POISONING OF THE SHIFT CATALYST BY HYDROGEN PRESENT IN THE REACTANTS IS AVOIDED, SAID IMPROVEMENT COMPRISING FIRST PASSING THE CARBON MONOXIDE AND STEAM OVER AN INORGANIC OXIDIC SOLID MATERIAL WHICH IS MORE BASIC ZINC OXIDE BEFORE PASSING THE REACTANTS OVER THE SHIFT CATALYST.
Claim 2
Dependent Claim
71 words
IN A PROCESS FOR PRODUCING HYDROGEN WHICH COMPRISES CONTACTING CARBON MONOXIDE WITH STEAM OVER A COPPER-CONTAINING/LOW TEMPERATURE SHIFT CATALYST WHICH INCLUDES COPPER AND ZINC OXIDE, THE IMPROVEMENT WHEREBY POISONING OF THE SHIFT CATALYST BY HYDROGEN PRESENT IN THE REACTANTS IS AVOIDED, SAID IMPROVEMENT COMPRISING FIRST PASSING THE CARBON MONOXIDE AND STEAM OVER AN INORGANIC OXIDIC SOLID MATERIAL WHICH IS MORE BASIC ZINC OXIDE BEFORE PASSING THE REACTANTS OVER THE SHIFT CATALYST.
Claim 3
Dependent Claim
13 words
The process according to claim 1 in which the material is alkalized alumina.
Claim 4
Dependent Claim
46 words
The process according to claim 1 in which the catalyst itself contains from 0.1 to 25% of a compound of a metal from Groups II to VII of the Periodic Table whose oxide is more basic than zinc oxide, in addition to copper and zinc oxide.
Claim 5
Dependent Claim
67 words
The process according to claim 1 in which a catalyst bed is used which comprises at its inlet portion a low temperature shift catalyst containing copper and zinc oxide and a quantity of an alkaline compound of an alkali metal equivalent to a sodium oxide content between 0.25 and 1.0%, and for the remainder a low temperature shift catalyst containing less than 0.25% of such alkaline compound.
Claim 6
Dependent Claim
17 words
The process according to claim 1 wherein the catalyst is a copper/zinc oxide/alumina low temperature shift catalyst.
Claim 7
Dependent Claim
13 words
The process according to claim 5 in which the material is alkalized alumina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |