US4874590A
Expired / Lapsed
US
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Catalytic reduction of nitrogen oxides
Assignee: Katalistiks International Inc
•
Filing: 1988-04-07
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Granted: 1989-10-17
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Expires: 2008-04-07
Abstract
Abstract This invention relates to a method for catalytically reducing one or more nitrogen oxides from a gaseous stream containing one or more nitrogen oxides and one or more sulfur oxides which comprises contacting said gaseous stream and ammonia with a microporous non-zeolitic molecular sieve composition at effective reduction conditions, wherein said microporous non-zeolitic molecular sieve composition is (i) optionally acid treated with an inorganic or organic acid, (ii) hydrogen-forming cation exchanged and (iii) optionally metal cation exchanged, prior to said contacting in said method.
Inventors
- 👤 Mark T. Staniulis
- 👤 Alan P. Risch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:58
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/82; B01J29/84; B01J29/85; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; B01D2255/00; B01D2255/20; B01D2255/204; B01D2255/2047; B01D2255/207; B01D2255/2073; B01D2255/20746
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
63 words
A method for catalytically reducing one or more nitrogen oxides from a gaseous stream containing one or more nitrogen oxides and one or more sulfur oxides which comprises contacting said gaseous stream and ammonia with a microporous non-zeolitic molecular sieve composition at effective reduction conditions, wherein said microporous non-zeolitic molecular sieve composition is hydrogen-forming cation exchanged prior to said contacting in said method.
Claim 2
Independent Claim
63 words
A method for catalytically reducing one or more nitrogen oxides from a gaseous stream containing one or more nitrogen oxides and one or more sulfur oxides which comprises contacting said gaseous stream and ammonia with a microporous non-zeolitic molecular sieve composition at effective reduction conditions, wherein said microporous non-zeolitic molecular sieve composition is hydrogen-forming cation exchanged prior to said contacting in said method.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is dealuminized by acid treatment with an acid selected from nitric acid, sulfuric acid, hydrocholoric acid, phosphorus acid, formic acid and trichloroacetic acid.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said microporous non-zeolitic molecular sieve composition is acid treated with nitric acid.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is hydrogen-forming cation exchanged with a hydrogen-forming cation selected from NH 4 + , H + or quaternary ammonium.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein said microporous non-zeolitic molecular sieve composition is hydrogen-forming cation exchanged with NH 4 + .
Claim 7
Dependent Claim
36 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is metal cation exchanged with a metal selected from copper, cobalt, vanadium, chronium, tungsten, nickel, platinum, palladium, manganese, molybdenum, rhodium, magnesium, aluminum and iron.
Claim 8
Dependent Claim
18 words
The method of claim 6 wherein said microporous non-zeolitic molecular sieve composition is metal cation exchanged with copper.
Claim 9
Dependent Claim
26 words
The method of claim 2 wherein said microporous non-zeolitic molecular sieve composition is simultaneously acid treated with an inorganic or organic acid and hydrogen-forming cation exchanged.
Claim 10
Dependent Claim
27 words
The method of claim 2 wherein said microporous non-zeolitic molecular sieve composition is hydrogen-forming cation exchanged prior to being acid treated with an inorganic or organic acid.
Claim 11
Dependent Claim
28 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is hydrothermally treated with steam prior to being acid treated with an inorganic or organic acid.
Claim 12
Dependent Claim
32 words
The method of claim 10 wherein said microporous non-zeolitic molecular sieve composition is hydrogen-forming cation exchanged and hydrothermally treated with steam prior to being acid treated with an inorganic or organic acid.
Claim 13
Dependent Claim
26 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is selected from SAPOs, ELAPSOs, AlPO 4 s, MeAPOs, FeAPOs, TAPOs, ELAPOs and MeAFSOs.
Claim 14
Dependent Claim
17 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is a SAPO molecular sieve.
Claim 15
Dependent Claim
17 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is an ELAPSO molecular sieve.
Claim 16
Dependent Claim
17 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is a MeAPSO molecular sieve.
Claim 17
Dependent Claim
17 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is an ELAPSO molecular sieve.
Claim 18
Dependent Claim
17 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is a MeAPO molecular sieve.
Claim 19
Dependent Claim
18 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is an AlPO 4 molecular sieve.
Claim 20
Dependent Claim
17 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is a TAPO molecular sieve.
Claim 21
Dependent Claim
19 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition is supported in an inorganic oxide matrix.
Claim 22
Dependent Claim
13 words
The method of claim 20 wherein the inorganic oxide matrix is predominantly silica.
Claim 23
Dependent Claim
17 words
The method of claim 1 wherein the gaseous stream contains at least nitrogen dioxide and sulfur dioxide.
Claim 24
Dependent Claim
34 words
The method of claim 1 in which ammonia is present in an amount sufficient to result in a molar ratio of said ammonia to said nitrogen oxides of from about 0.50:1 to about 1.50:1.
Claim 25
Dependent Claim
32 words
The method of claim 1 wherein said gaseous stream and ammonia are contacted with said microporous non-zeolitic molecular sieve composition at a temperature of from about 100° C. to about 650° C.
Claim 26
Dependent Claim
23 words
The method of claim 1 wherein said microporous non-zeolitic molecular sieve composition at a pressure of from about atmosphere to about 10 psig.
Claim 27
Dependent Claim
34 words
The method of claim 1 wherein said gaseous stream and ammonia are passed through said microporous non-zeolitic molecular sieve composition at a space velocity of from about 1000 to about 150,000 hr -1 .
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |