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EP0462593A1
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EP
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Use of a specific catalyst for purifying exhaust gases from Diesel engines
Assignee: Nippon Shokubai Co Ltd
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Filing: 1991-06-19
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Granted: —
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Expires: 2011-06-19
Abstract
Abstract A catalyst for purifying exhaust gas from Diesel engines, having a catalyst component-carrying layer made of a refractory three-dimensional structure having carried thereon a catalyst component containing (a) a refractory inorganic oxide, (b) at least one noble metal selected from palladium and platinum, and (c) rhodium, wherein the rhodium is contained only in an upper layer portion of the catalyst component-carrying layer corresponding to no more than 80 % in thickness of the catalyst component-carrying layer.
Inventors
- 👤 Makoto Horiuchi
- 👤 Satoshi Inui
- 👤 Koichi Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 20:52
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; B01J23/58; B01D53/944; B01J23/40; B01J23/46; B01J23/464; B01J37/00; B01J37/02; B01J37/024; B01J37/0244; F; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A catalyst for purifying exhaust gas from Diesel engines, having a catalyst component-carrying layer made of a refractory three-dimensional structure having carried thereon a catalyst component containing (a) a refractory inorganic oxide, (b) at least one noble metal selected from palladium and platinum, and (c) rhodium, wherein said rhodium is contained only in an upper layer portion of said catalyst component-carrying layer corresponding to no more than 80 % in thickness of said catalyst component-carrying layer.
Claim 2
Dependent Claim
79 words
The catalyst for purifying exhaust gas from Diesel engines as claimed in Claim 1, wherein said catalyst component-carrying layer comprises a first layer contacting said refractory three-dimensional structure and a second layer provided on said first layer, said first layer comprising a first catalyst component composed of said refractory inorganic oxide (a), and said at least one noble metal selected from palladium and platinum (b), and said second layer comprising a second catalyst component composed of said rhodium (c).
Claim 3
Dependent Claim
42 words
The catalyst for purifying exhaust gas from Diesel engines as claimed in Claim 1, wherein said refractory inorganic oxide is at least one member selected from the group consisting of alumina, silica, titania, zirconia, silica-alumina, alumina-zirconia, alumina-titania, silica-titania, silica-zirconia, titania-zirconia and zeolite.
Claim 4
Dependent Claim
21 words
The catalyst for purifying exhaust gas from Diesel engines as claimed in Claim 1, wherein said refractory inorganic oxide is zirconia.
Claim 5
Dependent Claim
42 words
The catalyst for purifying exhaust gas from Diesel engines as claimed in Claim 1, wherein said refractory three-dimensional structure is a ceramics foam, an open-flow-type ceramics honeycomb, a wall-flow-type honeycomb monolith, an open-flow-type metal honeycomb, a metal foam or a metal mesh.
Claim 6
Dependent Claim
29 words
The catalyst for purifying exhaust gas from Diesel engines as claimed in Claim 1, wherein said refractory three-dimensional structure is an open-flow-type ceramics honeycomb or an open-flow-type metal honeycomb.
References Cited (Backward Citations)
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