US5078981A
Expired / Lapsed
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Method for catalytically decomposing nitrogen oxides
Assignee: Tosoh Corp
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Filing: 1990-07-06
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Granted: 1992-01-07
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Expires: 2010-07-06
Abstract
Abstract A catalyst and a method for catalytically decomposing nitrogen oxides; the catalyst being composed of a zeolite having a mole ratio of SiO2/Al2O3 of at least 20 and containing copper ions and magnesium ions.
Inventors
- 👤 Shuichi Kagawa
- 👤 Yasutake Teraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/072; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D2255/00; B01D2255/20; B01D2255/204; B01D2255/2047; B01D2255/207; B01D2255/20761; B01D2255/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A method of removing nitrogen oxides from a gas containing the same by catalytically decomposing the nitrogen oxides, which comprises contacting a catalyst with a gas containing nitrogen oxides at a temperature sufficient to decompose the nitrogen oxides, thereby removing the nitrogen oxides by catalystic decomposition, said catalyst comprising a zeolite having a mole ratio of SiO 2 /Al 2 O 3 of at least 20 and containing copper ions in an amount of 0.01 to 1 in terms of the Cu/Al atomic ratio and magnesium ions in an amount of at least 0.01 in terms of the Mg/Al atomic ratio.
Claim 2
Independent Claim
101 words
A method of removing nitrogen oxides from a gas containing the same by catalytically decomposing the nitrogen oxides, which comprises contacting a catalyst with a gas containing nitrogen oxides at a temperature sufficient to decompose the nitrogen oxides, thereby removing the nitrogen oxides by catalystic decomposition, said catalyst comprising a zeolite having a mole ratio of SiO 2 /Al 2 O 3 of at least 20 and containing copper ions in an amount of 0.01 to 1 in terms of the Cu/Al atomic ratio and magnesium ions in an amount of at least 0.01 in terms of the Mg/Al atomic ratio.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the nitrogen oxides are decomposted at a temperature in the range of 400° C. to 700° C.
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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |