Patent US5700747A successfully refreshed from Google Patents.
US5700747A
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Exhaust gas cleaning catalyst complex and method for producing the same
Assignee: Mazda Motor Corp
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Filing: 1995-09-25
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Granted: 1997-12-23
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Expires: 2015-09-25
Abstract
Abstract An object is to elevate the NOx cleaning rate and heat resistance of an exhaust gas cleaning catalyst complex which comprises a noble metal catalyst supported on zeolite. Ni is supported in the form of NiO powder on said zeolite. Said NiO acts as a cocatalyst without the coverage of the activation site of the catalyst complex and closure of the gas passage by said NiO so as to elevate the NOx cleaning rate and heat resistance.
Inventors
- 👤 Makoto Kyogoku
- 👤 Hideharu Iwakuni
- 👤 Akihide Takami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:55
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/068
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
71 words
An exhaust gas cleaning catalyst complex for decomposing NO x in an exhaust gas under the presence of HC, said complex comprising: a first layer on a carrier and a second component carried on said first layer wherein the first layer is a noble metal catalyst layer comprising a noble metal catalyst supported on a crystalline metal-bearing silicate and wherein the second component is nickel in the form of nickel oxide.
Claim 2
Dependent Claim
71 words
An exhaust gas cleaning catalyst complex for decomposing NO x in an exhaust gas under the presence of HC, said complex comprising: a first layer on a carrier and a second component carried on said first layer wherein the first layer is a noble metal catalyst layer comprising a noble metal catalyst supported on a crystalline metal-bearing silicate and wherein the second component is nickel in the form of nickel oxide.
Claim 3
Dependent Claim
25 words
The exhaust gas cleaning catalyst complex according to claim 1, wherein the ratio by weight of Ni to said metal-bearing silicate is 2/100 to 51/100.
Claim 4
Dependent Claim
25 words
The exhaust gas cleaning catalyst complex according to claim 2, wherein the ratio by weight of Ni to said metal-bearing silicate is 5/100 to 46/100.
Claim 5
Dependent Claim
17 words
The exhaust gas cleaning catalyst complex according to claim 3, wherein said noble metal catalyst comprises Pt.
Claim 6
Dependent Claim
18 words
The exhaust gas cleaning catalyst complex according to claim 4, wherein said noble metal catalyst further comprises Rh.
Claim 7
Dependent Claim
55 words
An exhaust gas cleaning catalyst complex comprising: a first layer on a monolithic carrier and a second component carried on said first layer wherein the first layer is a noble metal catalyst layer comprising a noble metal catalyst supported on a crystalline metal-bearing silicate and wherein the second component is a nickel oxide power layer.
Claim 8
Dependent Claim
55 words
An exhaust gas cleaning catalyst complex comprising: a first layer on a monolithic carrier and a second component carried on said first layer wherein the first layer is a noble metal catalyst layer comprising a noble metal catalyst supported on a crystalline metal-bearing silicate and wherein the second component is a nickel oxide power layer.
Claim 9
Dependent Claim
25 words
The exhaust gas cleaning catalyst complex according to claim 6, wherein the ratio by weight of Ni to said metal-bearing silicate is 2/100 to 51/100.
Claim 10
Dependent Claim
25 words
The exhaust gas cleaning catalyst complex according to claim 7, wherein the ratio by weight of Ni to said metal-bearing silicate is 5/100 to 46/100.
Claim 11
Dependent Claim
17 words
The exhaust gas cleaning catalyst complex according to claim 8, wherein said noble metal catalyst comprises Pt.
Claim 12
Dependent Claim
18 words
The exhaust gas cleaning catalyst complex according to claim 9, wherein said noble metal catalyst further comprises Rh.
Claim 13
Independent Claim
101 words
A method for producing an exhaust gas cleaning catalyst complex comprising a first layer on a carrier and a second component carried on said first layer wherein the first layer is a noble metal catalyst layer comprising a noble metal catalyst supported on a crystalline metal-bearing silicate and wherein the second component is nickel oxide powder, said method comprising the steps of: preparing a powder comprising a noble metal catalyst supported n a metal-bearing silicate; coating a carrier with said powder to form the first noble metal catalyst layer; and support nickel oxide powder on said first noble metal catalyst layer.
Claim 14
Independent Claim
101 words
A method for producing an exhaust gas cleaning catalyst complex comprising a first layer on a carrier and a second component carried on said first layer wherein the first layer is a noble metal catalyst layer comprising a noble metal catalyst supported on a crystalline metal-bearing silicate and wherein the second component is nickel oxide powder, said method comprising the steps of: preparing a powder comprising a noble metal catalyst supported n a metal-bearing silicate; coating a carrier with said powder to form the first noble metal catalyst layer; and support nickel oxide powder on said first noble metal catalyst layer.
Claim 15
Dependent Claim
44 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 11, further comprising a step of supporting said noble metal catalyst layer on an monolithic carrier by wash-coating before the step of supporting said nickel oxide powder on said metal-bearing silicate.
Claim 16
Dependent Claim
31 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 12, wherein supporting said nickel oxide powder on said noble metal catalyst layer is carried out by wash-coating.
Claim 17
Dependent Claim
29 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 13, wherein the ratio by weight of Ni to said metal-bearing silicate is 2/100 to 51/100.
Claim 18
Dependent Claim
29 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 14, wherein the ratio by weight of Ni to said metal-bearing silicate is 5/100 to 46/100.
Claim 19
Dependent Claim
34 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 11, wherein the step of supporting said nickel oxide powder on said noble metal catalyst layer is carried out by wash-coating.
Claim 20
Dependent Claim
29 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 16, wherein the ratio by weight of Ni to said metal-bearing silicate is 2/100 to 51/100.
Claim 21
Dependent Claim
29 words
The method for producing an exhaust gas cleaning catalyst complex according to claim 17, wherein the ratio by weight of Ni to said metal-bearing silicate is 5/100 to 46/100.
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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) | 2000-12-22 | 2001-06-23 | 2001-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-22 | 2005-06-23 | 2005-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-22 | 2009-06-23 | 2009-12-23 | $7700.00 | Window Closed / Lapsed |