US5364606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
NOx reduction through the use of methane
Assignee: General Electric Co
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Filing: 1993-03-01
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Granted: 1994-11-15
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Expires: 2013-03-01
Abstract
Abstract This invention relates to the catalytic reduction of nitrogen monoxide (NO) from highly oxidizing environments. Such catalytic reductions of this type employ the use of small quantities of methane (CH 4 ) to provide a selective catalytic reduction (SCR) of the NO.
Inventors
- 👤 Stephen L. Hung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:57
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A method for selective catalytic reduction of NO x from a gas stream, said method comprising the steps of: providing a flow reactor having a catalyst disposed therein, said catalyst comprising a zeolite impregnated with zinc cations; introducing methane into said flow reactor; and introducing said gas stream into said flow reactor so that said methane reacts with said gas stream over said catalyst to catalytically reduce NO x in said gas stream.
Claim 2
Independent Claim
73 words
A method for selective catalytic reduction of NO x from a gas stream, said method comprising the steps of: providing a flow reactor having a catalyst disposed therein, said catalyst comprising a zeolite impregnated with zinc cations; introducing methane into said flow reactor; and introducing said gas stream into said flow reactor so that said methane reacts with said gas stream over said catalyst to catalytically reduce NO x in said gas stream.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said zeolite is additionally impregnated with copper cations.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said step of introducing said gas stream into said flow reactor comprises introducing said gas stream at a space velocity of approximately 22,000 hr -1 .
Claim 5
Dependent Claim
110 words
A selective catalytic reduction apparatus for the catalytic reduction of nitrogen monoxide, wherein said apparatus is comprised of: a catalyst means including an impregnated zeolite having a cation located substantially within said zeolite wherein said cation means are further comprised of zinc cations; a flow reactor means such that said catalyst means is substantially located within said flow reactor means; a gas stream having nitrogen monoxide operatively connected to said flow reactor means; and a methane gas means operatively connected to said flow reactor means such that said methane gas means and said catalyst substantially react with said gas stream to catalytically reduce said nitrogen monoxide in said gas stream.
Claim 6
Dependent Claim
110 words
A selective catalytic reduction apparatus for the catalytic reduction of nitrogen monoxide, wherein said apparatus is comprised of: a catalyst means including an impregnated zeolite having a cation located substantially within said zeolite wherein said cation means are further comprised of zinc cations; a flow reactor means such that said catalyst means is substantially located within said flow reactor means; a gas stream having nitrogen monoxide operatively connected to said flow reactor means; and a methane gas means operatively connected to said flow reactor means such that said methane gas means and said catalyst substantially react with said gas stream to catalytically reduce said nitrogen monoxide in said gas stream.
Claim 7
Dependent Claim
16 words
The apparatus, as in claim 4, wherein said cation means are further comprised of: copper cations.
Claim 8
Independent Claim
75 words
An apparatus for the selective catalytic reduction of NO x , said apparatus comprising: a flow reactor having a gas inlet through which methane and a gas stream including NO x can be introduced into said flow reactor; and a catalyst disposed within said flow reactor, said catalyst comprising a zeolite impregnated with zinc cations, whereby said methane reacts with said gas stream over said catalyst to catalytically reduce NO x in said gas stream.
Claim 9
Independent Claim
75 words
An apparatus for the selective catalytic reduction of NO x , said apparatus comprising: a flow reactor having a gas inlet through which methane and a gas stream including NO x can be introduced into said flow reactor; and a catalyst disposed within said flow reactor, said catalyst comprising a zeolite impregnated with zinc cations, whereby said methane reacts with said gas stream over said catalyst to catalytically reduce NO x in said gas stream.
Claim 10
Dependent Claim
14 words
The apparatus of claim 6 wherein said zeolite is additionally impregnated with copper cations.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-14 | 1998-05-16 | 1998-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-14 | 2002-05-16 | 2002-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-14 | 2006-05-16 | 2006-11-15 | $7700.00 | Window Closed / Lapsed |