US4528279A
Expired / Lapsed
US
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Monolithic catalyst for exhaust gas purification
Assignee: Cataler Corp
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Filing: 1984-03-23
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Granted: 1985-07-09
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Expires: 2004-03-23
Abstract
Abstract A monolithic catalyst, for the purification of exhaust gases from an internal combustion engine, comprising: an inert carrier; a film of alumina and rare earth oxides coated onto the surface of said inert carrier, wherein Ce and La are present in said film at an atomic ratio of Ce/La of 0.05-0.3 and the total content of rare earth oxides in said film is 2-50 wt. %, measured as R2O3, wherein R is an element of the lanthanide series of the Periodic Table; and said film carries a catalyst component containing at least one element of the platinum family.
Inventors
- 👤 Yoshihiro Suzuki
- 👤 Hiroo Kinoshita
- 👤 Masayasu Sato
- 👤 Masanori Ohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:55
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/10; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J37/00; B01J37/02; B01J37/0215; B01J37/024; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A monolithic catalyst, for the purification of exhaust gases from an internal combustion engine, comprising: an inert carrier; a film of alumina and rare earth oxides coated onto the surface of said inert carrier, wherein Ce and La are present in said film at an atomic ratio of Ce/La of 0.05-0.3:1, the total content of rare earth oxides in said film is 17.5-50 wt%, measured as R 2 O 3 , wherein R is an element of the lanthanide series of the Periodic Table, and Ce and La oxides are present in said film in an amount of greater than 90% by weight of the total rare earth oxides; and said film carries a catalyst component containing platinum and rhodium.
Claim 2
Dependent Claim
120 words
A monolithic catalyst, for the purification of exhaust gases from an internal combustion engine, comprising: an inert carrier; a film of alumina and rare earth oxides coated onto the surface of said inert carrier, wherein Ce and La are present in said film at an atomic ratio of Ce/La of 0.05-0.3:1, the total content of rare earth oxides in said film is 17.5-50 wt%, measured as R 2 O 3 , wherein R is an element of the lanthanide series of the Periodic Table, and Ce and La oxides are present in said film in an amount of greater than 90% by weight of the total rare earth oxides; and said film carries a catalyst component containing platinum and rhodium.
Claim 3
Dependent Claim
26 words
The monolithic catalyst according to claim 1, wherein the inert carrier is selected from the group consisting of cordierite, mullite, alpha-alumina, silicon nitride, magnesia and zirconia.
Claim 4
Dependent Claim
27 words
The monolithic catalyst according to claim 1, wherein said alumina is selected from the group consisting of amorphous alumina gel, gamma-alumina chi-alumina, delta-alumina, ata-alumina, kappa-alumina and theta-alumina.
Claim 5
Dependent Claim
32 words
The monolithic catalyst according to claim 1, wherein the specific surface area of said alumina is 10-300 m 2 /g and the average particle size of said alumina is less than 30μ.
Claim 6
Dependent Claim
20 words
The monolithic catalyst according to claim 4, wherein the specific surface area of said alumina is 30-150 m 2 /g.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |