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US5409671A
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Catalytic converter for treating exhaust gas
Assignee: Mazda Motor Corp
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Filing: 1994-03-21
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Granted: 1995-04-25
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Expires: 2014-03-21
Abstract
Abstract A catalytic convertor for treating exhaust gas includes a first catalyst layer formed on a base material and a second catalyst layer formed on the first catalyst layer. The first catalyst layer is composed of metal-containing silicate provided with transition metal by ion exchange and at least one precious metal borne on the silicate, and the second catalyst layer is composed of metal-containing silicate provided with transition metal by ion exchange and at least one metal borne on the silicate which is selected from the group consisting of Zr, Co, Cu, Cr, Mn, Y, Fe, Ni, V, Ti, Zn, Ga, Ba, Mg, La, Ce, Pr, Nd, Sm and Tb and differs from the transition metal provided on the silicate by ion exchange.
Inventors
- 👤 Takashi Takemoto
- 👤 Yasuto Watanabe
- 👤 Masahiko Shigetsu
- 👤 Kazunari Komatsu
- 👤 Makoto Kyogoku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:09
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01J37/0246; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01D53/9445; B01D53/945; B01J37/0244; B01D2251/00; B01D2251/20; B01D2251/208; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/20; B01D2255/204; B01D2255/2047; B01D2255/207; B01D2255/20738; B01D2255/20761; B01D2255/50; B01D2255/504; B01D2255/90; B01D2255/902; B01D2255/9022; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
136 words
A catalytic converter for treating exhaust gas comprising a first catalyst layer formed on a base material and a second catalyst layer formed on the first catalyst layer, the first catalyst layer being composed of metal-containing silicate provided with transition metal by ion exchange and at least one precious metal borne on the silicate, and the second catalyst layer being composed of metal-containing silicate provided with transition metal by ion exchange and at least one metal borne on the silicate which is selected from the group consisting of Zr, Co, Cu, Cr, Mn, Y, Fe, Ni, V, Ti, Zn, Ca, Ba, Mg, La, Ce, Pr, Nd, Sm and Tb and which differs from the transition metal provided on the silicate by ion exchange and the precious metal borne on the silicate of the first catalyst layer.
Claim 2
Dependent Claim
136 words
A catalytic converter for treating exhaust gas comprising a first catalyst layer formed on a base material and a second catalyst layer formed on the first catalyst layer, the first catalyst layer being composed of metal-containing silicate provided with transition metal by ion exchange and at least one precious metal borne on the silicate, and the second catalyst layer being composed of metal-containing silicate provided with transition metal by ion exchange and at least one metal borne on the silicate which is selected from the group consisting of Zr, Co, Cu, Cr, Mn, Y, Fe, Ni, V, Ti, Zn, Ca, Ba, Mg, La, Ce, Pr, Nd, Sm and Tb and which differs from the transition metal provided on the silicate by ion exchange and the precious metal borne on the silicate of the first catalyst layer.
Claim 3
Dependent Claim
24 words
A catalytic convertor as defined in claim 1 in which said metal-containing silicate for the first and second catalyst layers is Cu-ion exchange zeolite.
Claim 4
Dependent Claim
20 words
A catalytic convertor as defined in claim 1 in which said precious metal for the first catalyst layer is Pt.
Claim 5
Dependent Claim
27 words
A catalytic convertor as defined in claim 1 in which said at least one metal borne on the metal-containing silicate for the second catalyst layer is Zr.
Claim 6
Dependent Claim
38 words
A catalytic convertor as defined in claim 1 in which the number of the precious metal atoms for the first catalyst layer is substantially equal to the number of ions of the transition metal of the metal-containing silicate.
Claim 7
Dependent Claim
46 words
A catalytic convertor as defined in claim 1 in which the number of atoms of said at least one metal borne on the metal-containing silicate for the second catalyst layer is substantially equal to the number of ions of the transition metal of the metal-containing silicate.
Claim 8
Dependent Claim
20 words
A catalytic convertor as defined in claim 2 in which said precious metal for the first catalyst layer is Pt.
Claim 9
Dependent Claim
27 words
A catalytic convertor as defined in claim 7 in which said at least one metal borne on the metal-containing silicate for the second catalyst layer is Zr.
Claim 10
Dependent Claim
27 words
A catalytic convertor as defined in claim 2 in which said at least one metal borne on the metal-containing silicate for the second catalyst layer is Zr.
Claim 11
Dependent Claim
46 words
A catalytic convertor as defined in claim 5 in which the number of atoms of said at least one metal borne on the metal-containing silicate for the second catalyst layer is substantially equal to the number of ions of the transition metal of the metal-containing silicate.
Claim 12
Dependent Claim
89 words
A catalytic convertor for treating exhaust gas comprising a first catalyst layer formed on a base material and a second catalyst layer formed on the first catalyst layer, wherein the first catalyst layer is composed of Cu-ion exchange zeolite provided with transition metal by ion exchange and Pt borne on the zeolite, and the second catalyst layer is composed of Cu-ion exchange zeolite provided with transition metal by ion exchange and Zr borne on the zeolite, which differs from the transition metal provided on the silicate by ion exchange.
Claim 13
Dependent Claim
89 words
A catalytic convertor for treating exhaust gas comprising a first catalyst layer formed on a base material and a second catalyst layer formed on the first catalyst layer, wherein the first catalyst layer is composed of Cu-ion exchange zeolite provided with transition metal by ion exchange and Pt borne on the zeolite, and the second catalyst layer is composed of Cu-ion exchange zeolite provided with transition metal by ion exchange and Zr borne on the zeolite, which differs from the transition metal provided on the silicate by ion exchange.
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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) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |