Patent EP0430437A2 successfully refreshed from Google Patents.
EP0430437A2
Expired / Lapsed
EP
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Three-way catalyst for automotive emission control
Assignee: Ford-Werke GmbH
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Filing: 1990-10-26
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Granted: —
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Expires: 2010-10-26
Abstract
Abstract A three-way catalyst for automotive emission control having a mechanical carrier having a support comprised substantially of alumina, a lanthanum oxide coating decorated onto the support, a catalytic compound discontinuously supported on the decorated support having a major constituent of palladium, and a discontinuous phase of titanium oxide on the alumina, lanthana, and catalytic compound composite. The method of making such three-way catalyst for automotive emission control, comprises coating an alumina support with lanthana, impregnating the coated support with a palladium compound to form a discontinuous phase on the lanthana, and impregnating the coated support and catalytic compound with an organo-titania compound to form a discontinuous phase on the lanthana and palladium compound.
Inventors
- 👤 Mohinder Singh Chattha
- 👤 William Lewis Henderson Watkins
- 👤 Haren Sakarlal Gandhi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 20:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J37/00; B01J37/02; B01J37/024; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A three-way catalyst for automotive emission control, comprising, a mechanical carrier having a support comprised substantially of alumina, discontinuous lanthanum oxide on said support, a catalytic palladium compound supported discontinuously on the decorated support having a major constituent of palladium, a discontinuous phase of titanium oxide on said alumina, lanthana, and catalytic compound composite.
Claim 2
Dependent Claim
54 words
A three-way catalyst for automotive emission control, comprising, a mechanical carrier having a support comprised substantially of alumina, discontinuous lanthanum oxide on said support, a catalytic palladium compound supported discontinuously on the decorated support having a major constituent of palladium, a discontinuous phase of titanium oxide on said alumina, lanthana, and catalytic compound composite.
Claim 3
Dependent Claim
20 words
A catalyst as claimed in claim 1, in which said discontinuous palladium compound covers .05-10% of said lanthana decorated support.
Claim 4
Dependent Claim
30 words
A catalyst as claimed in claim 1 or 2, in which said discontinuous titanuim oxide phase is a washcoat constituting up to 8% of the total weight of the catalyst.
Claim 5
Dependent Claim
22 words
A catalyst as claimed in claim 3, in which said catalytic palladium compound forms .05-5% of the total weight of the catalyst.
Claim 6
Dependent Claim
23 words
A catalyst as claimed in claim 1, in which said discontinuous titanuim oxide phase is .1-2.0% of the total weight of the catalyst.
Claim 7
Dependent Claim
17 words
A catalyst as claimed in claim 1, in which said catalytic compound contains up to 2.5% platinum.
Claim 8
Dependent Claim
34 words
A catalyst as claimed in claim 1, in which no greater than 40% of the surface area of each exposed particle of catalytic compound or decorated support is covered by said titanium oxide phase.
Claim 9
Independent Claim
74 words
A method of making a three-way catalyst for automotive emission control, the method comprising, discontinuously coating an alumina support with lanthana, impregnating the coated support with a palladium comprising compound to form a discontinuous phase on the lanthana and support, and impregnating the coated support and catalytic compound with an organo-titanium compound to form, upon heating, a discontinuous titanium oxide phase on the exposed portions of said discontinuous lanthana and palladium comprising compound phases.
Claim 10
Independent Claim
74 words
A method of making a three-way catalyst for automotive emission control, the method comprising, discontinuously coating an alumina support with lanthana, impregnating the coated support with a palladium comprising compound to form a discontinuous phase on the lanthana and support, and impregnating the coated support and catalytic compound with an organo-titanium compound to form, upon heating, a discontinuous titanium oxide phase on the exposed portions of said discontinuous lanthana and palladium comprising compound phases.
Claim 11
Dependent Claim
52 words
A method as claimed in claim 8, in which palladium is added in a diluted palladium nitrate solution with the amount of acid being regulated to a pH of 3-5, and after drying the support wetted with said acid, calcining the composite at a temperature in the range of 450-650 o C.
Claim 12
Dependent Claim
36 words
A method as claimed in claim 8, in which said organo-titanium compound is dissolved in a liquid for wetting said composite, said wetted composite being calcined at a temperature of 400-600 o C for 4-12 hours.
Claim 13
Dependent Claim
35 words
A method as claimed in claim 10, in which said calcination is staged to include heating to 250-280 o C for 1-1/2 to 2-1/2 hours, and thence heating to 400-600 o C for 5-10 hours.
Claim 14
Dependent Claim
49 words
A method as claimed in claim 8, in which said support is a collection of aggregates prepared by (i) wetting a particulate source of alumina with dilute nitric acid to form a slurry, (ii) drying said slurry to form a cake, and (iii) crushing said cake into particle form.
Claim 15
Dependent Claim
15 words
A method as claimed in claim 8, in which said organo-titanium compound is titanium butoxide.
References Cited (Backward Citations)
No citation records indexed.
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