US4297328A
Expired / Lapsed
US
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Three-way catalytic process for gaseous streams
Assignee: Union Carbide Corp
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Filing: 1979-09-28
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Granted: 1981-10-27
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Expires: 1999-09-28
Abstract
Abstract A process for the catalytic combustion of carbon monoxide and hydrocarbons and the catalytic reduction of the oxides of nitrogen contained in a gas stream. The process involves intimately contacting the gaseous stream with a catalyst bed comprising copper metal or copper ion and a high silica zeolite.
Inventors
- 👤 James S. Ritscher
- 👤 Michael R. Sandner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:23
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/46; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
A process for the concurrent catalytic reduction of oxides of nitrogen and the oxidation of carbon monoxide and hydrocarbons contained in a gas stream wherein said process consists essentially of contacting the gas stream with a high-silica zeolite containing copper metal or ions, said zeolite having a silica to alumina ratio of at least 20, and wherein said gas stream contains a stoichiometric excess of oxidant.
Claim 2
Dependent Claim
66 words
A process for the concurrent catalytic reduction of oxides of nitrogen and the oxidation of carbon monoxide and hydrocarbons contained in a gas stream wherein said process consists essentially of contacting the gas stream with a high-silica zeolite containing copper metal or ions, said zeolite having a silica to alumina ratio of at least 20, and wherein said gas stream contains a stoichiometric excess of oxidant.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the gas stream is the exhaust stream of an internal combustion engine.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein the oxidant comprises not less than 2 percent oxygen present in the gas stream.
Claim 5
Dependent Claim
20 words
A process according to claim 2, wherein the oxidant comprises less than 2 percent oxygen present in the gas stream.
Claim 6
Dependent Claim
68 words
A process for the concurrent catalytic reduction of oxides of nitrogen and the oxidation of carbon monoxides and hydrocarbons contained in the exhaust stream of an internal combustion engine wherein said process comprises contacting the exhaust stream with copper-containing high-silica zeolite at a temperature of about 350° C. or greater in the presence of oxygen and when the reductant to oxidant ratio is between about 0.50 and 2.39.
Claim 7
Dependent Claim
68 words
A process for the concurrent catalytic reduction of oxides of nitrogen and the oxidation of carbon monoxides and hydrocarbons contained in the exhaust stream of an internal combustion engine wherein said process comprises contacting the exhaust stream with copper-containing high-silica zeolite at a temperature of about 350° C. or greater in the presence of oxygen and when the reductant to oxidant ratio is between about 0.50 and 2.39.
Claim 8
Dependent Claim
17 words
The process of claim 5 wherein the reductant to oxidant ratio is between about 0.63 and 2.39.
Claim 9
Dependent Claim
67 words
The process of claim 1 or 5 wherein the copper-containing zeolite is an organophilic zeolite composition having in the dehydrated state a composition in terms of mole ratios of oxides as: 1.6-2.0 Cu.sup.++ O:0.2M.sub.2/n :Al.sub.2 O.sub.3 :20-100 SiO.sub.2 wherein M is at least one carbon having a valence of "n", said composition having a characteristic X-ray powder diffraction pattern containing at least the d-spacings of Table I.
Claim 10
Dependent Claim
20 words
The process of claim 5 wherein the copper-containing high-silica zeolite has a silica to alumina ratio of at least 20.
Claim 11
Dependent Claim
12 words
The process of claim 7 wherein M represents an alkali metal cation.
Claim 12
Dependent Claim
20 words
The process of claim 7 wherein the SiO 2 /Al 2 O 3 mole ratio is from 35 to 85.
Claim 13
Dependent Claim
20 words
The process of claim 7 wherein the SiO 2 /Al 2 O 3 mole ratio is from 35 to 55.
Claim 14
Dependent Claim
17 words
The process of claim 1 or 8 wherein the copper-containing high-silica zeolite is a ZSM-5 type zeolite.
References Cited (Backward Citations)
US3346328A
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US3716344A
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US4157375A
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US4170571A
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |