US3885019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic reducing decomposition of oxides of nitrogen
Assignee: Mitsubishi Chemical Corp
•
Filing: 1973-12-26
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Granted: 1975-05-20
•
Expires: 1993-12-26
Abstract
Abstract The oxides of nitrogen in an exhaust gas are reductively decomposed over a catalyst of cerium oxide or uranium oxide in the presence of ammonia.
Inventors
- 👤 Kunichi Matsushita
- 👤 Hikaru Sakurada
- 👤 Kazuhiko Onuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:26
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/10; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01J23/12; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; B01D2255/00; B01D2255/20; B01D2255/206; B01D2255/2065
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
IN A PROCESS FOR THE CATALYTIC OF OXIDES OF NITROGEN PRESENT IN EXHAUST GAS, THE IMPROVEMENT WHICH COMPRISES: CONTACTING SAID EXHAUST GAS WITH A CATALYST OF CERIUM OXIDE OR URANIUM OXIDE IN THE PRESENCE OF AMMONIA.
Claim 2
Dependent Claim
36 words
IN A PROCESS FOR THE CATALYTIC OF OXIDES OF NITROGEN PRESENT IN EXHAUST GAS, THE IMPROVEMENT WHICH COMPRISES: CONTACTING SAID EXHAUST GAS WITH A CATALYST OF CERIUM OXIDE OR URANIUM OXIDE IN THE PRESENCE OF AMMONIA.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said catalyst of cerium oxide is supported on a carrier.
Claim 4
Dependent Claim
23 words
The process of claim 2, wherein said carrier is selected from the group consisting of alumina, silica, silica-alumina, titania, diatomaceous earth and zirconia.
Claim 5
Dependent Claim
26 words
The process of claim 1, wherein said catalyst of cerium oxide supported on a carrier is fabricated from gamma -alumina which is calcined at 550*- 1000*C.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein said catalyst of cerium oxide is supported on a carrier of a base coated with gamma -alumina.
Claim 7
Dependent Claim
23 words
The process of claim 1, wherein said catalyst of cerium oxide is supported on a carrier of a base coated with titanium oxide.
Claim 8
Dependent Claim
36 words
The process of claim 1, wherein said catalyst of cerium oxide is prepared by immersing a carrier treated with an acid in an aqueous solution of a cerium salt and then calcining said immersed cerium oxide.
Claim 9
Dependent Claim
47 words
The process of claim 1, wherein said catalyst of cerium oxide is prepared by immersing a carrier in an aqueous solution of a cerium salt; washing said immersed carrier in water, aqueous ammonia or an aqueous solution of an ammonium salt and than calcining said washed carrier.
Claim 10
Dependent Claim
23 words
The process of claim 1, wherein said catalyst contains 0.01 to 50% by weight cerium oxide or uranium oxide supported on a carrier.
Claim 11
Dependent Claim
24 words
The process of claim 1, wherein said exhaust gas containing oxides of nitrogen and ammonia is contacted with said catalyst at 200* to 650*C.
Claim 12
Dependent Claim
31 words
The process of claim 1, wherein said exhaust gas containing oxides of nitrogen and ammonia is passed through a catalyst zone at a space velocity of 1000 to 150,000 hr 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |