EP0234441A2
Expired / Lapsed
EP
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Catalyst for reduction of oxides of nitrogen
Assignee: Saint Gobain Abrasives Inc
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Filing: 1987-02-13
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Granted: —
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Expires: 2007-02-13
Abstract
Abstract A catalyst for the selective reduction of a nitrogen oxides to nitrogen in the presence of ammonia in the form of composite bodies formed from a mixture of zirconia (5 to 50% by weight), a zeolite (50 to 90%), a bond material (0 to 30%), and, optionally, a promoter selected from oxides of vanadium and copper in the amount of at least 0.1% by weight.
Inventors
- 👤 William H. Gerdes
- 👤 Charles Lim
- 👤 Thomas Szymanski
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 07:24
CPC Classifications
B; B01; B01J; B01J20/00; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J29/00; B01J29/04; B01J29/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
1 . A catalyst for the selective reduction of Nox to nitrogen in the presence of ammonia, characterized by the fact that said catalyst is a shaped coformed mixture of 5 to 50 % by weight of zirconia starting material having a surface area of at least 10 square meters per gram and containing 50% to 90% of one or more zeolites in the hydrogen or ammonium form and 0 to 30% of a bonding agent.
Claim 2
Dependent Claim
76 words
1 . A catalyst for the selective reduction of Nox to nitrogen in the presence of ammonia, characterized by the fact that said catalyst is a shaped coformed mixture of 5 to 50 % by weight of zirconia starting material having a surface area of at least 10 square meters per gram and containing 50% to 90% of one or more zeolites in the hydrogen or ammonium form and 0 to 30% of a bonding agent.
Claim 3
Dependent Claim
21 words
2 . A catalyst according to claim 1, characterized by the fact that said zeolite contains a major portion of clinoptilolite.
Claim 4
Dependent Claim
15 words
A catalyst according to claim 1, characterized by the fact that said zeolite is clinoptilolite.
Claim 5
Dependent Claim
24 words
4 . A catalyst according to claim 1, characterized by the fact that the zirconia is derived from the hydrolysis of a zirconyl salt.
Claim 6
Dependent Claim
32 words
A catalyst according to any one of the preceding claims, characterized by the fact that said zirconia is derived from the hydrolysis of one or more zirconium salts to Zr0 2 .
Claim 7
Dependent Claim
30 words
A catalyst according to any one of the preceding claims, characterized by containing at least 0.1% by weight of a promoter which is an oxide of vanadium or of copper.
Claim 8
Dependent Claim
27 words
A catalyst according to any one of the preceding claims, characterized by the fact that the active catalyst composition is coated onto a metal or ceramic support.
Claim 9
Dependent Claim
31 words
A catalyst according to any one of the preceding claims, characterized by the fact that the zirconia starting material has a surface area of at least 50 square meter per gram.
Claim 10
Dependent Claim
28 words
A catalyst according to any one of the preceding claims, characterized by being in the form of rings, spheres, cross partition rings, stars, saddles, aggregates, honeycombs, or pellets.
References Cited (Backward Citations)
No citation records indexed.
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