US5733837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for catalytic reduction of nitrogen oxides
Assignee: Cosmo Oil Co Ltd
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Filing: 1996-04-05
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Granted: 1998-03-31
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Expires: 2016-04-05
Abstract
Abstract A catalyst for catalytic reduction of nitrogen oxides using a hydrocarbon and/or a oxygen-containing organic compound as a reducing agent is disclosed, which comprises a cerium oxide supported on a solid acid carrier. Also, a catalyst for catalytic reduction of nitrogen oxides using a hydrocarbon and/or an oxygen-containing organic compound as a reducing agent is disclosed, which comprises: (a) at least one element selected from the elements of Group Ib, Group IIa, Group IIb, Group IIIa, Group IIIb, Group IVa, Group IVb, Group Va, Group VIa, Group VIIa, and Group VIII in the Periodic Table (hereinafter referred to as the elements belonging to group (a)); and (b) a cerium oxide, supported on a solid acid carrier.
Inventors
- 👤 Tadao Nakatsuji
- 👤 Hiromitsu Shimizu
- 👤 Ritsu Yasukawa
- 👤 Katsumi Miyamoto
- 👤 Hiroshi Tsuchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:14
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; B01D2251/00; B01D2251/20; B01D2251/208; B01D2255/00; B01D2255/20; B01D2255/206; B01D2255/2065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
A composition for a catalytic reduction of nitrogen oxides comprising at least one reducing agent selected from the group consisting of a hydrocarbon and an oxygen-containing organic compound, and a catalyst consisting essentially of cerium oxide supported on a solid acid carrier, wherein the cerium supporting ratio is 30 wt % to 80 wt. % based on the total amount of the solid acid carrier and the cerium oxide.
Claim 2
Dependent Claim
69 words
A composition for a catalytic reduction of nitrogen oxides comprising at least one reducing agent selected from the group consisting of a hydrocarbon and an oxygen-containing organic compound, and a catalyst consisting essentially of cerium oxide supported on a solid acid carrier, wherein the cerium supporting ratio is 30 wt % to 80 wt. % based on the total amount of the solid acid carrier and the cerium oxide.
Claim 3
Dependent Claim
33 words
The composition according to claim 1, wherein the hydrocarbon is at least one compound selected from the group consisting of a lower alkyne, a lower alkene, a lower diene and a lower alkane.
Claim 4
Dependent Claim
31 words
The composition according to claim 1, wherein the oxygen-containing organic compound is at least one compound selected from the group consisting of an alcohol, an ether, a carboxylate and a ketone.
Claim 5
Dependent Claim
29 words
The composition according to claim 1, wherein the hydrocarbon and oxygen-containing organic compound are present in an amount of from 0.1 to 2 mols per mol of nitrogen oxides.
Claim 6
Dependent Claim
13 words
The composition according to claim 1, wherein the reducing agent is the hydrocarbon.
Claim 7
Dependent Claim
15 words
The composition according to claim 1, wherein the reducing agent is the oxygen-containing organic compound.
Claim 8
Dependent Claim
18 words
The composition according to claim 1, wherein the solid acid carrier is a zeolite type solid acid carrier.
Claim 9
Dependent Claim
39 words
A catalyst for catalytic reduction of nitrogen oxides using at least one reducing agent selected from the group consisting of a hydrocarbon and an oxygen-containing organic compound, which consists essentially of cerium oxide supported on a solid acid carrier.
Claim 10
Dependent Claim
39 words
A catalyst for catalytic reduction of nitrogen oxides using at least one reducing agent selected from the group consisting of a hydrocarbon and an oxygen-containing organic compound, which consists essentially of cerium oxide supported on a solid acid carrier.
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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) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |