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US4965243A
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Process for producing a catalyst for purifying exhaust gases from internal combustion engines
Assignee: BASF Catalysts LLC
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Filing: 1990-02-09
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Granted: 1990-10-23
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Expires: 2010-02-09
Abstract
Abstract A three-way catalyst for the purification of automotive exhaust is made by depositing on a monolithic support a slurry containing a platinum group element, active alumina, cerium oxide a barium compound and a zirconium compound and calcining the support.
Inventors
- 👤 Teiji Yamada
- 👤 Masaki Funabiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:49
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J21/00; B01J21/02; B01J21/04; B01J21/06; B01J21/066; B01J23/10; B01J23/40; B01J23/42; B01J23/46; B01J23/464; B01J23/58; B01J35/00; B01J35/50; B01J35/56; B01J35/57
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
A process for producing an exhaust gas purifying catalyst by depositing a slurry containing at least one platinum-group element, active alumina, cerium oxide, a barium compound and a zirconium compound as catalyst ingredients on a monolithic support and calcining the support having the catalyst ingredient deposited thereon, which comprises (a) a step of preparing active alumina containing the platinum-group element, (b) a step of preparing a slurry containing the platinum-group element and active alumina from step (a), cerium oxide, the barium compound and the zirconium compound, and (c) a step of depositing the slurry on the monolithic support, followed by calcination.
Claim 2
Dependent Claim
101 words
A process for producing an exhaust gas purifying catalyst by depositing a slurry containing at least one platinum-group element, active alumina, cerium oxide, a barium compound and a zirconium compound as catalyst ingredients on a monolithic support and calcining the support having the catalyst ingredient deposited thereon, which comprises (a) a step of preparing active alumina containing the platinum-group element, (b) a step of preparing a slurry containing the platinum-group element and active alumina from step (a), cerium oxide, the barium compound and the zirconium compound, and (c) a step of depositing the slurry on the monolithic support, followed by calcination.
Claim 3
Dependent Claim
19 words
The process set forth in claim 1 wherein the monolithic support is of a honeycomb-like or three-dimensional network structure.
Claim 4
Dependent Claim
17 words
The process set forth in claim 1 or 2 wherein the monolithic support is composed of cordierite.
Claim 5
Dependent Claim
19 words
The process set forth in claim 1 or 2 wherein the monolithic support is composed of a refractory metal.
Claim 6
Dependent Claim
16 words
The process set forth in claim 1 wherein the platinum-group element consists of platinum and rhodium.
Claim 7
Dependent Claim
23 words
The process set forth in claim 1 wherein the weight of platinum is 0.1 to 10 g per liter of the finished catalyst.
Claim 8
Dependent Claim
23 words
The process set forth in claim 1 wherein the weight of rhodium is 0.02 to 2 g per liter of the finished catalyst.
Claim 9
Dependent Claim
24 words
The process set forth in claim 1 wherein the weight of active alumina is 30 to 200 g per liter of the finished catalyst.
Claim 10
Dependent Claim
24 words
The process set forth in claim 1 wherein the weight of cerium oxide is 10 to 150 g per liter of the finished catalyst.
Claim 11
Dependent Claim
14 words
The process set forth in claim 1 wherein the barium compound is barium hydroxide.
Claim 12
Dependent Claim
29 words
The process set forth in claim 1 wherein the weight of the barium compound is 0.1 to 20 g calculated as barium oxide per liter of the finished catalyst.
Claim 13
Dependent Claim
14 words
The process set forth in claim 1 wherein the zirconium compound is zirconyl acetate.
Claim 14
Dependent Claim
29 words
The process set forth in claim 1 wherein the weight of the zirconium compound is 0.1 to 30 g calculated as zirconyl acetate per liter of the finished catalyst.
References Cited (Backward Citations)
US4621071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |