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US5206196A
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Catalyst for purifying exhaust gas
Assignee: Tosoh Corp
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Filing: 1991-12-12
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Granted: 1993-04-27
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Expires: 2011-12-12
Abstract
Abstract A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt, (b) a rare earth metal and (c) silver, or nickel and/or zinc, or platinum and/or manganese, or copper and/or rhodium, incorporated thereinto.
Inventors
- 👤 Masao Nakano
- 👤 Akinori Eshita
- 👤 Kazuhiko Sekizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:39
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
59 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt, (b) a rare earth metal and (c) silver, incorporated therein.
Claim 2
Dependent Claim
59 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt, (b) a rare earth metal and (c) silver, incorporated therein.
Claim 3
Dependent Claim
48 words
A catalyst for purifying an exhaust gas as claimed in claim 1, wherein said zeolite has the composition: xM.sub.2/n O·Al.sub.2 O.sub.3 ·ySiO.sub.2 ·zH.sub.2 O wherein n is a valency of the cation, x is 0.8 to 2, y is at least 2, and z is at least 0.
Claim 4
Dependent Claim
46 words
A catalyst for purifying an exhaust gas as claimed in claim 1, wherein the contents of the cobalt and the rare earth metal are 0.1 to 1.5 times and 0.1 to 1 time, respectively, in terms of a mole ratio to the alumina in the zeolite.
Claim 5
Dependent Claim
50 words
A catalyst for purifying an exhaust gas as claimed in claim 1, wherein the content of silver is 0.05 to 2 times and the total content of cobalt, rare earth metal and silver is 1.0 to 2.5 times, in terms of a mole ratio to the alumina in the zeolite.
Claim 6
Dependent Claim
72 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons, comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt and (b) a rare earth metal and (c) at least one metal selected from the group consisting of nickel and zinc, incorporated therein.
Claim 7
Dependent Claim
72 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons, comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt and (b) a rare earth metal and (c) at least one metal selected from the group consisting of nickel and zinc, incorporated therein.
Claim 8
Dependent Claim
48 words
A catalyst for purifying an exhaust gas as claimed in claim 5, wherein said zeolite has the composition: xM.sub.2/n O·Al.sub.2 O.sub.3 ·ySiO.sub.2 ·zH.sub.2 O wherein n is a valency of the cation, x is 0.8 to 2, y is at least 2, and z is at least 0.
Claim 9
Dependent Claim
46 words
A catalyst for purifying an exhaust gas as claimed in claim 5, wherein the contents of the cobalt and the rare earth metal are 0.1 to 1.5 times and 0.1 to 1 time, respectively, in terms of a mole ratio to the alumina in the zeolite.
Claim 10
Dependent Claim
55 words
A catalyst for purifying an exhaust gas as claimed in claim 5, wherein the content of nickel or zinc is 0.05 to 2 times and the total content of cobalt and rare earth metal and nickel and/or zinc is 1.0 to 2.5 times, in terms of a mole ratio to the alumina in the zeolite.
Claim 11
Dependent Claim
72 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt and (b) a rare earth metal and (c) at least one metal selected from the group consisting of platinum and manganese, incorporated therein.
Claim 12
Dependent Claim
72 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt and (b) a rare earth metal and (c) at least one metal selected from the group consisting of platinum and manganese, incorporated therein.
Claim 13
Dependent Claim
48 words
A catalyst for purifying an exhaust gas as claimed in claim 9, wherein said zeolite has the composition: xM.sub.2/n O·Al.sub.2 O.sub.3 ·ySiO.sub.2 ·zH.sub.2 O wherein n is a valency of the cation, x is 0.8 to 2, y is at least 2, and z is at least 0.
Claim 14
Dependent Claim
46 words
A catalyst for purifying an exhaust gas as claimed in claim 9, wherein the contents of the cobalt and the rare earth metal are 0.1 to 1.5 times and 0.1 to 1 time, respectively, in terms of a mole ratio to the alumina in the zeolite.
Claim 15
Dependent Claim
55 words
A catalyst for purifying an exhaust gas as claimed in claim 9, wherein the content of platinum or manganese is 0.05 to 1.5 times and the total content of cobalt and rare earth metal and platinum and/or manganese is 1.0 to 2.5 times, in terms of a mole ratio to the alumina in the zeolite.
Claim 16
Dependent Claim
72 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt and (b) a rare earth metal and (c) at least one metal selected from the group consisting of copper and rhodium, incorporated therein.
Claim 17
Dependent Claim
72 words
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO 2 /Al 2 O 3 mole ratio of at least 15 and (ii) (a) cobalt and (b) a rare earth metal and (c) at least one metal selected from the group consisting of copper and rhodium, incorporated therein.
Claim 18
Dependent Claim
48 words
A catalyst for purifying an exhaust gas as claimed in claim 13, wherein said zeolite has the composition: xM.sub.2/n O·Al.sub.2 O.sub.3 ·ySiO.sub.2 ·zH.sub.2 O wherein n is a valency of the cation, x is 0.8 to 2, y is at least 2, and z is at least 0.
Claim 19
Dependent Claim
46 words
A catalyst for purifying an exhaust gas as claimed in claim 13, wherein the contents of the cobalt and the rare earth metal are 0.1 to 1.5 times and 0.1 to 1 time, respectively, in terms of a mole ratio to the alumina in the zeolite.
Claim 20
Dependent Claim
55 words
A Catalyst for purifying an exhaust gas as claimed in claim 13, wherein the content of copper or rhodium is 0.05 to 1.5 times and the total content of cobalt and rare earth metal and copper and/or rhodium is 1.0 to 2.5 times, in terms of a mole ratio to the alumina in the zeolite.
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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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |