US5474965A
Expired / Lapsed
US
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Catalyst for catalytic reduction of nitrogen oxide
Assignee: Cosmo Oil Co Ltd
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Filing: 1993-12-13
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Granted: 1995-12-12
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Expires: 2013-12-13
Abstract
Abstract A novel catalyst for catalytic reduction of nitrogen oxide using a hydrocarbon as a reducing agent is provided, which comprises (a) at least an element of the platinum group selected from the group consisting of platinum, iridium, rhodium and ruthenium and (b) gold, and which may further comprises (c) at least a metallic oxide selected from the group consisting of cerium oxide, lanthanum oxide, neodymium oxide, germanium oxide and gallium oxide.
Inventors
- 👤 Tadao Nakatsuji
- 👤 Hiromitsu Shimizu
- 👤 Ritsu Yasukawa
- 👤 Masaaki Kawatsuki
- 👤 Mitsunori Tabata
- 👤 Hiroshi Tsuchida
- 👤 Yoshiaki Kintaichi
- 👤 Motoi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:37
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01J23/48; B01J23/52; B01D2251/00; B01D2251/20; B01D2251/208; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1025; B01D2255/1026; B01D2255/1028; B01D2255/106; B01D2255/20; B01D2255/206; B01D2255/2063; B01D2255/2065; B01D2255/2068
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
66 words
A catalyst for catalytic reduction of nitrogen oxide using a hydrocarbon as a reducing agent, which comprises: (a) at least one element of the platinum group selected from the group consisting of platinum, iridium, rhodium and ruthenium; and (b) gold in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the at least one element of the platinum group.
Claim 2
Dependent Claim
66 words
A catalyst for catalytic reduction of nitrogen oxide using a hydrocarbon as a reducing agent, which comprises: (a) at least one element of the platinum group selected from the group consisting of platinum, iridium, rhodium and ruthenium; and (b) gold in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the at least one element of the platinum group.
Claim 3
Dependent Claim
32 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 1, wherein the catalyst is supported on a carrier in an amount of 0.1 to 10 wt % by percent support.
Claim 4
Dependent Claim
115 words
A catalyst for catalytic reduction of nitrogen oxide using a hydrocarbon as a reducing agent, which comprises: (a) at least one element of the platinum group selected from the group consisting of platinum, iridium, rhodium and ruthenium; (b) gold in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the at least one element of the platinum group; and (c) at least one metallic oxide selected from the group consisting of cerium oxide, lanthanum oxide, neodymium oxide, germanium oxide and gallium oxide in an amount of 100 to 100,000 parts by weight based on 100 parts by weight of the at least one element of the platinum group.
Claim 5
Dependent Claim
115 words
A catalyst for catalytic reduction of nitrogen oxide using a hydrocarbon as a reducing agent, which comprises: (a) at least one element of the platinum group selected from the group consisting of platinum, iridium, rhodium and ruthenium; (b) gold in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the at least one element of the platinum group; and (c) at least one metallic oxide selected from the group consisting of cerium oxide, lanthanum oxide, neodymium oxide, germanium oxide and gallium oxide in an amount of 100 to 100,000 parts by weight based on 100 parts by weight of the at least one element of the platinum group.
Claim 6
Dependent Claim
32 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 3, wherein the catalyst is supported on a carrier in an amount of 1 to 50 wt % by percent support.
Claim 7
Dependent Claim
20 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 1, wherein the catalyst comprises gold, rhodium, and platinum.
Claim 8
Dependent Claim
33 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 1, wherein the at least one element of the platinum group is selected from the group consisting of iridium, rhodium and ruthenium.
Claim 9
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 1, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 10
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 5, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 11
Dependent Claim
20 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 2, wherein the catalyst comprises gold, rhodium, and platinum.
Claim 12
Dependent Claim
33 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 2, wherein the at least one element of the platinum group is selected from the group consisting of iridium, rhodium and ruthenium.
Claim 13
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 2, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 14
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 9, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 15
Dependent Claim
20 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 3, wherein the catalyst comprises gold, rhodium, and platinum.
Claim 16
Dependent Claim
33 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 3, wherein the at least one element of the platinum group is selected from the group consisting of iridium, rhodium and ruthenium.
Claim 17
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 3, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 18
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 13, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 19
Dependent Claim
20 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 4, wherein the catalyst comprises gold, rhodium, and platinum.
Claim 20
Dependent Claim
33 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 4, wherein the at least one element of the platinum group is selected from the group consisting of iridium, rhodium and ruthenium.
Claim 21
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 4, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
Claim 22
Dependent Claim
42 words
The catalyst for catalytic reduction of nitrogen oxide according to claim 17, wherein the gold is present in an amount of 0.1 to 1 part by weight per 100 parts by weight of the at least one element of the platinum group.
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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) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |