US5269140A
Expired / Lapsed
US
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Exhaust gas purifier for methanol-fueled engines
Assignee: Nichias Corp
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Filing: 1990-10-24
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Granted: 1993-12-14
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Expires: 2010-10-24
Abstract
Abstract An adsorber comprising zeolite retained on structure of substantially inorganic fibers disposed in the exhaust gas stream of an engine. The invention has particular application to purification of exhaust gas streams of methanol fueled engines in combination with catalytic means for decomposing undesired organic matter from the exhaust gas stream. The adsorber adsorbs organic matter from the exhaust gas at relatively low exhaust gas temperatures at which the catalyst is of reduced effectiveness, and desorbs organic matter at elevated temperatures at which the catalyst is of heightened effectiveness.
Inventors
- 👤 Shigeo Take
- 👤 Masaji Kurosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/082; B01J29/084; B01J35/00; B01J35/50; B01J35/58; F; F01; F01N; F01N13/00; F01N13/009; F01N3/00; F01N3/08; F01N3/0807; F01N3/0814; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; B01J35/56; F01N2250/00; F01N2250/12; F01N2330/00; F01N2330/06; F01N2370/00; F01N2370/22; F01N2370/24; F01N2510/00; F01N2510/06; F01N2510/063; F01N2510/12; F01N2510/14; F01N2570/00; F01N2570/20; F01N3/18; F01N3/20; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
47 words
An exhaust-gas purifier for a methanol fueled engine comprising: an X-type zeolite adsorbent which adsorbs organic matter from the exhaust-gas ejected from the methanol-fueled engine; and a catalyst which decomposes said organic matter, the adsorbent comprising X-type zeolite impregnated into a honeycomb structure made of synthetic fibers.
Claim 2
Dependent Claim
47 words
An exhaust-gas purifier for a methanol fueled engine comprising: an X-type zeolite adsorbent which adsorbs organic matter from the exhaust-gas ejected from the methanol-fueled engine; and a catalyst which decomposes said organic matter, the adsorbent comprising X-type zeolite impregnated into a honeycomb structure made of synthetic fibers.
Claim 3
Dependent Claim
43 words
The exhaust-gas purifier of claim 1, wherein the X-type zeolite adsorbent has a water saturated adsorption at 100° C. of at least 5 g of H 2 O per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg.
Claim 4
Dependent Claim
54 words
An exhaust gas purifier for a methanol fueled engine comprising: an X-type zeolite adsorbent for adsorbing organic matter from exhaust gas ejected from the methanol-fueled engine; and enclosing means for communicating exhaust gas to the X-type zeolite adsorbent, wherein the X-type zeolite adsorbent comprises X-type zeolite impregnated into a honeycomb structure of synthetic fibers.
Claim 5
Dependent Claim
54 words
An exhaust gas purifier for a methanol fueled engine comprising: an X-type zeolite adsorbent for adsorbing organic matter from exhaust gas ejected from the methanol-fueled engine; and enclosing means for communicating exhaust gas to the X-type zeolite adsorbent, wherein the X-type zeolite adsorbent comprises X-type zeolite impregnated into a honeycomb structure of synthetic fibers.
Claim 6
Dependent Claim
27 words
The purifier of claim 3, further comprising a catalyst which receives exhaust gas from said adsorbent and which serves to decompose organic matter of said exhaust gas.
Claim 7
Dependent Claim
42 words
The purifier of claim 3, wherein the X-type zeolite adsorbent has a water saturated adsorption at 100° C. of at least 5 g of H 2 O per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg.
Claim 8
Dependent Claim
35 words
The purifier of claim 4, wherein said X-type zeolite is disposed on said structure in a density of about 100 to 200 grams of zeolite per square meter of structure exposed to the exhaust gas.
Claim 9
Dependent Claim
85 words
A methanol engine exhaust gas treating apparatus, comprising: an X-type zeolite containing structure for adsorbing organic matter from said exhaust gas, said X-type zeolite containing structure being disposed to receive engine exhaust gas, and a catalytic converter for decomposing organic matter from said exhaust gas, said catalytic converter being disposed to receive exhaust gas after the exhaust gas has been exposed to the X-type zeolite containing structure; wherein said X-type zeolite containing structure comprises X-type zeolite impregnated into a honeycomb structure made of synthetic fibers.
Claim 10
Dependent Claim
85 words
A methanol engine exhaust gas treating apparatus, comprising: an X-type zeolite containing structure for adsorbing organic matter from said exhaust gas, said X-type zeolite containing structure being disposed to receive engine exhaust gas, and a catalytic converter for decomposing organic matter from said exhaust gas, said catalytic converter being disposed to receive exhaust gas after the exhaust gas has been exposed to the X-type zeolite containing structure; wherein said X-type zeolite containing structure comprises X-type zeolite impregnated into a honeycomb structure made of synthetic fibers.
Claim 11
Dependent Claim
41 words
The engine exhaust gas treating apparatus of claim 7, wherein said X-type zeolite containing structure comprises about 100 to 200 grams of zeolite per square meter of surface area of X-type zeolite containing structure exposed to receive said engine exhaust gas.
Claim 12
Independent Claim
97 words
A method of treating exhaust gas of a methanol-fueled engine, comprising the steps of: exposing the exhaust gas to an X-type zeolite adsorbent impregnated into a honeycomb structure made of synthetic fibers to adsorb organic matter from the exhaust gas; and after exposing the exhaust gas to the X-type zeolite adsorbent, exposing the exhaust gas to a catalyst to decompose organic matter in the exhaust gas, the X-type zeolite adsorbent tending to adsorb organic matter at relatively lower engine exhaust operating temperatures and tending to desorb previously adsorbed organic matter at relatively higher engine exhaust operating temperatures.
Claim 13
Independent Claim
97 words
A method of treating exhaust gas of a methanol-fueled engine, comprising the steps of: exposing the exhaust gas to an X-type zeolite adsorbent impregnated into a honeycomb structure made of synthetic fibers to adsorb organic matter from the exhaust gas; and after exposing the exhaust gas to the X-type zeolite adsorbent, exposing the exhaust gas to a catalyst to decompose organic matter in the exhaust gas, the X-type zeolite adsorbent tending to adsorb organic matter at relatively lower engine exhaust operating temperatures and tending to desorb previously adsorbed organic matter at relatively higher engine exhaust operating temperatures.
Claim 14
Dependent Claim
19 words
The method of claim 9 wherein the X-type zeolite adsorbent is disposed on a structure of primarily inorganic fibers.
Claim 15
Dependent Claim
42 words
The method of claim 9 wherein the X-type zeolite adsorbent has a water saturated adsorption at 100° C. of at least 5 g of H 2 O per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg.
Claim 16
Dependent Claim
42 words
A process for purifying methanol engine exhaust gas comprising the steps of: exposing said gas to an X-type zeolite impregnated into a honeycomb structure of synthetic fibers, and then exposing said gas to a catalyst for decomposing organic compounds in said gas.
Claim 17
Dependent Claim
42 words
A process for purifying methanol engine exhaust gas comprising the steps of: exposing said gas to an X-type zeolite impregnated into a honeycomb structure of synthetic fibers, and then exposing said gas to a catalyst for decomposing organic compounds in said gas.
Claim 18
Independent Claim
133 words
A method of treating exhaust gas from a methanol-fueled engine by passing it through: a first container having an exhaust gas flowpath and containing an X-type zeolite having a water saturated adsorption at 100° C. of at least about 5 g of water per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg disposed in the exhaust gas flowpath of the first container such that the X-type zeolite is impregnated into a honeycomb structure of synthetic fibers, the first container connected to a second container such that exhaust exiting the first container passes into the second container, the second container having an exhaust gas flowpath therein and having a catalyst disposed in the exhaust gas flowpath of the second container which decomposes organic matter in the exhaust gas.
Claim 19
Independent Claim
133 words
A method of treating exhaust gas from a methanol-fueled engine by passing it through: a first container having an exhaust gas flowpath and containing an X-type zeolite having a water saturated adsorption at 100° C. of at least about 5 g of water per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg disposed in the exhaust gas flowpath of the first container such that the X-type zeolite is impregnated into a honeycomb structure of synthetic fibers, the first container connected to a second container such that exhaust exiting the first container passes into the second container, the second container having an exhaust gas flowpath therein and having a catalyst disposed in the exhaust gas flowpath of the second container which decomposes organic matter in the exhaust gas.
Claim 20
Dependent Claim
142 words
A controlled emissions power unit comprising: a methanol-fueled engine and an exhaust gas system, the exhaust gas system comprising: a first chamber connected to the methanol-fueled engine to receive exhaust gas from the methanol-fueled engine and having therein an X-type zeolite having a water saturated adsorption at 100° C. of at least about 5 g of water per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg, the zeolite disposed so as to contact exhaust gas received from the methanol-fueled engine such that the X-type zeolite is impregnated into a honeycomb structure of synthetic fibers, and a second chamber connected to receive exhaust gas from the first chamber and having therein a catalyst to enhance decomposition of organic matter in the exhaust gas, the catalyst disposed so as to contact exhaust gas received from the first chamber.
Claim 21
Dependent Claim
142 words
A controlled emissions power unit comprising: a methanol-fueled engine and an exhaust gas system, the exhaust gas system comprising: a first chamber connected to the methanol-fueled engine to receive exhaust gas from the methanol-fueled engine and having therein an X-type zeolite having a water saturated adsorption at 100° C. of at least about 5 g of water per 100 g of zeolite under a water vapor partial pressure of 10 mm Hg, the zeolite disposed so as to contact exhaust gas received from the methanol-fueled engine such that the X-type zeolite is impregnated into a honeycomb structure of synthetic fibers, and a second chamber connected to receive exhaust gas from the first chamber and having therein a catalyst to enhance decomposition of organic matter in the exhaust gas, the catalyst disposed so as to contact exhaust gas received from the first chamber.
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) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |