US4013588A
Expired / Lapsed
US
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Oxidation catalyst for removal of nitrogen monoxide in exhaust gas
Assignee: Kogyo Kaihatsu Kenyusho
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Filing: 1974-05-06
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Granted: 1977-03-22
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Expires: 1994-05-06
Abstract
Abstract The oxidation catalyst of this application is prepared by grinding and heat treating the tuff consisting essentially of SiO2, Al2O3 and H2O, and containing a total of 1 to 10% by weight of an alkaline metal oxide and alkaline earth metal oxide and having the X-ray diffraction pattern shown in the Table I or Table II. This catalyst eliminates NO in a dry exhaust gas which contains at least a small amount of oxygen.
Inventors
- 👤 Takaaki Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:56
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J23/00; B01J23/02; B01J23/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
An oxidation catalyst for the removal of nitrogen monoxide in exhaust gas, said catalyst being obtained by a procedure comprising heating a naturally occurring inorganic material at a temperature of from 100° to 900° C, said naturally occurring inorganic material being a tuff consisting essentially of SiO 2 , Al 2 O 3 and H 2 O, containing 1 to 10% by weight of total of an alkaline metal oxide and an alkaline earth metal oxide and having the X-ray diffraction pattern shown in Table I or Table II, said inorganic material having a mesh size of less than 50 mesh.
Claim 2
Dependent Claim
101 words
An oxidation catalyst for the removal of nitrogen monoxide in exhaust gas, said catalyst being obtained by a procedure comprising heating a naturally occurring inorganic material at a temperature of from 100° to 900° C, said naturally occurring inorganic material being a tuff consisting essentially of SiO 2 , Al 2 O 3 and H 2 O, containing 1 to 10% by weight of total of an alkaline metal oxide and an alkaline earth metal oxide and having the X-ray diffraction pattern shown in Table I or Table II, said inorganic material having a mesh size of less than 50 mesh.
Claim 3
Dependent Claim
20 words
An oxidation catalyst according to claim 1 wherein said inorganic material has been reduced to a mesh size of 3-5.
Claim 4
Dependent Claim
26 words
An oxidation catalyst according to claim 1 in which said naturally occurring inorganic material is heated at a temperature of between 200° C to 700° C.
Claim 5
Dependent Claim
24 words
An oxidation catalyst according to claim 3 wherein said naturally occurring inorganic material is heated at a temperature of between 200° to 600° C.
Claim 6
Dependent Claim
26 words
An oxidation catalyst according to claim 1 wherein said alkaline metal oxide and alkaline earth metal oxides are K 2 O, Na 2 O and CaO.
References Cited (Backward Citations)
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US3476508A
Cited
US3498743A
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US3498928A
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US3545917A
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US3864450A
Cited
US3880618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |