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US3962138A Expired / Lapsed US ⏱️ 0.0 years remaining

Cobalt-oxide-based catalytic substances for the oxidation of ammonia

Assignee: Rhone Progil SA
•
Filing: 1974-03-18
•
Granted: 1976-06-08
•
Expires: 1994-03-18
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Abstract

Abstract The invention concerns catalytic substances for the oxidation of ammonia, for the production of nitric acid, comprising cobalt oxide as the main component. Such substances, besides cobalt oxide, also contain additives formed of aluminum oxide and possibly oxides of thorium, cerium, zinc and cadmium, the amount of aluminum oxide added being from 5% to 15% by weight of the finished substances and the amount of the other oxides being from 0 to 25% by weight of the finished substances; these substances are in particular shaped by pelleting or extrusion, dried and then calcined at temperatures of the order of from 900° to 1000°C. The advantages of these catalytic substances lie in a high degree of activity and a high level of strength, which are maintained during use thereof.

Inventors

  • 👤 Jean-Louis Ray
  • 👤 Robert Laugier

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 08:53
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/75; B01J23/76; B01J23/83; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/265; B01J37/00; B01J37/0009; B01J37/02; B01J37/03

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 75 words
Shaped catalytic substances for the oxidation of ammonia, for the production of nitric acid, having a high mechanical strength and a long life, characterized in that they are devoid of alkali metals and formed of a mixture of calcined bodies of 60-95% by weight tricobalt tetraoxide, 5-15% by weight of aluminum oxide and 0 to 25% by weight of an oxide of a metal selected from the group consisting of thorium, cerium, zinc and cadmium.
Claim 2
Dependent Claim 75 words
Shaped catalytic substances for the oxidation of ammonia, for the production of nitric acid, having a high mechanical strength and a long life, characterized in that they are devoid of alkali metals and formed of a mixture of calcined bodies of 60-95% by weight tricobalt tetraoxide, 5-15% by weight of aluminum oxide and 0 to 25% by weight of an oxide of a metal selected from the group consisting of thorium, cerium, zinc and cadmium.
Claim 3
Dependent Claim 37 words
Catalytic substances according to claim 1, characterized in that they also contain at least one of the oxides selected from the group consisting of zirconium oxide and the oxides of rare earth metals other than cerium oxide.
Claim 4
Dependent Claim 32 words
A method of producing the catalytic substances according to claim 1, characterized in that the oxides are shaped, dried and calcined at a temperature of the order of from 900° to 1000°C.
Claim 5
Dependent Claim 36 words
A method of producing catalytic substances according to claim 1, characterized in that they are shaped by extrusion, which is followed by drying, and calcining at a temperature of the order of from 900° to 1000°C.

References Cited (Backward Citations)

US858904A Cited
US1207706A Cited
GB137071A Cited
US1399807A Cited
US1713045A Cited
US1919005A Cited
US2467446A Cited
GB1236819A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-06-08 1979-12-08 1980-06-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-06-08 1983-12-08 1984-06-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-06-08 1987-12-08 1988-06-08 $7700.00 Window Closed / Lapsed

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