US4123391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auto emission purifying catalyst and method of manufacture
Assignee: Toyota Motor Corp
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Filing: 1976-10-26
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Granted: 1978-10-31
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Expires: 1996-10-26
Abstract
Abstract An auto emission purification catalyst which comprises palladium supported on a carrier composed mainly of alpha -alumina having a total porosity volume of 0.05-0.50 cc/g and an average porosity diameter of 0.05-0.5 mu .
Inventors
- 👤 Masaaki Noguchi
- 👤 Tsuchio Bunda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:24
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J37/00; B01J37/0009; B01J35/61; B01J35/612; B01J35/63; B01J35/633; B01J35/64; B01J35/653
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
31 words
An auto emission purification catalyst, comprising: palladium supported on an α-alumina carrier having a total pore volume of 0.05 - 0.50 cc/g and an average pore diameter of 0.05 - 5.0μ.
Claim 2
Dependent Claim
31 words
An auto emission purification catalyst, comprising: palladium supported on an α-alumina carrier having a total pore volume of 0.05 - 0.50 cc/g and an average pore diameter of 0.05 - 5.0μ.
Claim 3
Dependent Claim
22 words
The catalyst of claim 1, wherein the total pore volume of said carrier is in the range of 0.1 - 0.3 cc/g.
Claim 4
Dependent Claim
21 words
The catalyst of claim 1, wherein the average pore diameter of said carrier is in the range of 0.1 - 2μ.
Claim 5
Dependent Claim
21 words
The catalyst of claim 1, wherein the palladium content on said carrier is in the range of 0.3 - 2.0 g/l.
Claim 6
Dependent Claim
19 words
The catalyst of claim 1, wherein said carrier is in the form of cylindrical, columnar or pellet shaped objects.
Claim 7
Dependent Claim
38 words
A process of preparing an auto emission purification catalyst, comprising: forming an α-alumina carrier having a total pore volume of 0.05 - 0.50 cc/g and an average pore diameter of 0.05-5.0μ; and thereafter supporting palladium on said carrier.
Claim 8
Dependent Claim
38 words
A process of preparing an auto emission purification catalyst, comprising: forming an α-alumina carrier having a total pore volume of 0.05 - 0.50 cc/g and an average pore diameter of 0.05-5.0μ; and thereafter supporting palladium on said carrier.
Claim 9
Dependent Claim
18 words
The process of claim 6, wherein said palladium is supported in amounts ranging from 0.3 - 2.0 g/l.
Claim 10
Dependent Claim
71 words
The process of claim 6, wherein said α-alumina carrier is prepared by: (a) crushing α-alumina and an aluminum compound which yields α-alumina upon firing; (b) mixing a sinter promoting agent and a binding agent with said crushed mixture of α-alumina and said aluminum compound; (c) forming a slurry of said mixture and molding said mixture into the desired shape; and (d) sintering said molded material at a temperature of 1100°-1500° C.
Claim 11
Dependent Claim
54 words
The process of claim 7, wherein less than 20 weight % of at least one compound selected from the group consisting of SiO 2 , TiO 2 , ZrO 2 , CaO, MgO, B 2 O 3 , MnO 2 , Cr 2 O 3 and CuO is employed as the α-alumina sinter-promoting agent.
Claim 12
Dependent Claim
65 words
The process of claim 6, wherein said palladium is supported on said α-alumina carrier by: (a) immersing said α-alumina carrier in a solution containing a palladium compound, thereby effectively supporting said compound on said carrier; (b) drying said supported palladium compound; (c) heat treating said dried supported compound at a temperature of 1350° C. for 3 hours; and then (d) washing said treated supported compound.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |