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US5147516A
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NOx reduction by sulfur tolerant coronal-catalytic apparatus and method
Assignee: NEW HAMPSHIRE A CORP OF NH, University of
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Filing: 1990-07-19
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Granted: 1992-09-15
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Expires: 2010-07-19
Abstract
Abstract This invention presents an NO x environment effective reduction apparatus comprising a sulfur tolerant coronal-catalyst such as high dielectric coronal-catalysts like glass wool, ceramic-glass wool or zirconium glass wool and method of use. In one embodiment the invention comprises an NO x reduction apparatus of sulfur tolerant coronal-catalyst adapted and configured for hypercritical presentation to an NO x bearing gas stream at a minimum of at least about 75 watts/cubic meter.
Inventors
- 👤 Virendra K. Mathur
- 👤 Ronald W. Breault
- 👤 Christopher R. McLarnon
- 👤 Frank G. Medros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:48
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8659; B01D53/8662; B01D53/32; B01D53/8621; B01D53/8625; B01D53/8628; B01D53/8631; B01D53/8668; Y; Y02; Y02C; Y02C20/00; Y02C20/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A method of environment effective reducing of NO x emission comprising the step of reactively exposing NO x to a sulfur tolerant coronal-catalyst said catalyst in a filamentous form and said exposing occurring at an electric power density of at least about 75 watts/meter 3 .
Claim 2
Independent Claim
46 words
A method of environment effective reducing of NO x emission comprising the step of reactively exposing NO x to a sulfur tolerant coronal-catalyst said catalyst in a filamentous form and said exposing occurring at an electric power density of at least about 75 watts/meter 3 .
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the coronal-catalyst is a high dielectric catalyst.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein the coronal-catalyst is glass wool.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the coronal-catalyst is ceramic-glass wool.
Claim 6
Independent Claim
64 words
A method of environmental effective reducing of NO x emission comprising the step of reactively exposing NO x to a sulfur tolerant coronal-catalyst said catalyst in a filamentous form wherein said coronal-catalyst is adapted and configured for hypercritical presentation to an NO x bearing gas stream wherein said exposing occurs at a minimum electric power density of at least about 75 watts/meter 3 .
Claim 7
Independent Claim
64 words
A method of environmental effective reducing of NO x emission comprising the step of reactively exposing NO x to a sulfur tolerant coronal-catalyst said catalyst in a filamentous form wherein said coronal-catalyst is adapted and configured for hypercritical presentation to an NO x bearing gas stream wherein said exposing occurs at a minimum electric power density of at least about 75 watts/meter 3 .
Claim 8
Dependent Claim
13 words
The method of claim 5 wherein the coronal-catalyst is a high dielectric catalyst.
Claim 9
Dependent Claim
11 words
The method of claim 6 wherein the coronal-catalyst is glass wool.
Claim 10
Dependent Claim
11 words
The method of claim 6 wherein the coronal-catalyst is ceramic-glass wool.
Claim 11
Dependent Claim
137 words
The method of claim 5 further comprising; providing an NO x environment effective reduction apparatus comprising a sulfur tolerant coronal-catalyst of glass wool or ceramic-glass wool; disposing said coronal-catalyst in from one to a plurality of tubular members configured and adapted to receive a flow of NO x bearing gas; maintaining said coronal-catalyst at an electrical power density of at least about 75 watts/meter 3 ; said coronal-catalyst being present in amounts of from about 0.5 to about 150 kg/m 3 ; applying to said one to a plurality of tubular members voltage from about 4000 to about 30,000 volts; said voltage having a frequency of from 60 Hz to about 30,000 Hz; maintaining residency of said flow of NO x bearing gas in said tubular members of from about 0.2 to about 5 seconds or more.
Claim 12
Dependent Claim
22 words
The method of claim 9 further comprising applying said voltage by means of a midpoint ground transformer or a cold cathode transformer.
Claim 13
Dependent Claim
18 words
The method of claim 5 further comprising adding suitable quantity of a reducing gas to increase no reduction.
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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |