EP0219854A2
Expired / Lapsed
EP
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Catalyst for reduction of nitrogen oxides
Assignee: Saint Gobain Abrasives Inc
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Filing: 1986-10-21
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Granted: —
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Expires: 2006-10-21
Abstract
Abstract A catalyst for the selective reduction of nitrogen oxides to nitrogen in the presence of ammonia in the form of composite bodies formed from a mixture of anatase (5 to 40% by weight), a zeolite (50 to 90%), a bond material (0 to 30%, and, optionally, promoter which is an oxide of vanadium, molybdenum, or 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
2026-10-29 21:35
CPC Classifications
B; B01; B01J; B01J8/00; 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: 9
Claim 1
Independent Claim
76 words
A catalyst for the selective reduction of NOx to nitrogen in the presence of ammonia, said catalyst being a shaped coformed mixture of 5 to 40% by weight of anatase starting material having a surface area of at least loo square meters per gram and containing at least 0.25 weight percent sulfate, 50 to 90% of one or more acid stable zeolites in the hydrogen or ammonium form and up to 30% of a bonding agent.
Claim 2
Dependent Claim
76 words
A catalyst for the selective reduction of NOx to nitrogen in the presence of ammonia, said catalyst being a shaped coformed mixture of 5 to 40% by weight of anatase starting material having a surface area of at least loo square meters per gram and containing at least 0.25 weight percent sulfate, 50 to 90% of one or more acid stable zeolites in the hydrogen or ammonium form and up to 30% of a bonding agent.
Claim 3
Dependent Claim
29 words
A catalyst according to claim 1, which contains at least 0.1% by weight of a promoter which is an oxide of vanadium, molybdenum, or copper or a combination thereof.
Claim 4
Dependent Claim
18 words
A catalyst according to claim 1 or 2, in which said zeolite contains a major portion of clinoptilolite.
Claim 5
Dependent Claim
14 words
A catalyst according to claim 1 or 2, in which said zeolite is clinoptilolite.
Claim 6
Dependent Claim
28 words
A catalyst according to any one of the preceding claims, where the required sulfate is added by exposing the finished catalyst to sulfur oxides or sulfur oxide precursors.
Claim 7
Dependent Claim
38 words
A catalyst according to any one of the preceding claims, in which said anatase is derived from the hydrolysis of one or more titanium salts to T10 2 to which sulfur oxides or sulfur oxide precursors are added.
Claim 8
Dependent Claim
22 words
A catalyst according to any one of the preceding claims, in which said anatase is derived from the hydrolysis of titanyl sulfate.
Claim 9
Dependent Claim
26 words
A catalyst according to any one of the preceding claims, which is in the form of rings, cross partition rings, stars, saddles, aggregates, honeycombs, or pellets.
References Cited (Backward Citations)
No citation records indexed.
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