EP0427970A2
Expired / Lapsed
EP
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Process for reducing NOx in an exhaust gas using a precious metal/ZSM-5 catalyst
Assignee: Cataler Corp
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Filing: 1990-10-17
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Granted: —
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Expires: 2010-10-17
Abstract
Abstract A catalyst for purifying exhaust gases contains: a catalyst support, a zeolite layer formed on the catalyst support, and noble metals such as platinum, palladium, rhodium and the like loaded on the zeolite layer by a predetermined parts by weight or more with respect to 100 parts by weight of the zeolite layer. The catalyst for purifying exhaust gases maintains a superior exhaust gas conversion performance over a long period of time.
Inventors
- 👤 Kazunobu Ishibashi
- 👤 Shinichi Matsumoto
- 👤 Shiroh C/O K. K. Toyota Chuo Kenkyusho Kondoh
- 👤 Yasuhide C/O Cataler Industrial Co. Ltd. Utsumi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/068; B01J37/00; B01J37/02; B01J37/024; B01J37/0246; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
43 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and platinum loaded on said zeolite layer by 1.3 parts by weight or more with respect to 100 parts by weight of said zeolite layer.
Claim 2
Dependent Claim
43 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and platinum loaded on said zeolite layer by 1.3 parts by weight or more with respect to 100 parts by weight of said zeolite layer.
Claim 3
Dependent Claim
31 words
The catalyst for purifying exhaust gases according to claim 1, wherein said zeolite layer comprises a zeolite having pores whose diameters fall in the range of from 5 to 10 Å.
Claim 4
Dependent Claim
38 words
The catalyst for purifying exhaust gases according to claim 1, wherein said zeolite layer comprises a zeolite which has chemical formula, xM 2/n ·Al₂O₃·ySiO₂, wherein the SiO₂/Al₂O₃ molar ratio falls in the range of from 10 to 200.
Claim 5
Dependent Claim
35 words
The catalyst for purifying exhaust gases according to claim 1, wherein said catalyst support is one selected from the group consisting of a pellet-shaped catalyst support, a monolithic catalyst support and a metal catalyst support.
Claim 6
Dependent Claim
19 words
The catalyst for purifying exhaust gases according to claim 1, wherein said catalyst support is made of a zeolite.
Claim 7
Dependent Claim
37 words
The catalyst for purifying exhaust gases according to claim 1, wherein said zeolite layer comprises at least one zeolite selected from the group consisting of analcimes, soadlites, type "A" zeolites, faujacites, natrolites, mordenites, heulandites and synthetic zeolites.
Claim 8
Dependent Claim
43 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and palladium loaded on said zeolite layer by 0.8 parts by weight or more with respect to 100 parts by weight of said zeolite layer.
Claim 9
Dependent Claim
43 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and palladium loaded on said zeolite layer by 0.8 parts by weight or more with respect to 100 parts by weight of said zeolite layer.
Claim 10
Dependent Claim
31 words
The catalyst for purifying exhaust gases according to claim 7, wherein said zeolite layer comprises a zeolite having pores whose diameters fall in the range of from 5 to 10 Å.
Claim 11
Dependent Claim
40 words
The catalyst for purifying exhaust gases according to claim 7, wherein said zeolite layer comprises a zeolite which has chemical formula, xM 2/n ·Al₂O₃ ySiO₂, wherein the SiO₂/Al₂ O₃ molar ratio falls in the range of from 10 to 200.
Claim 12
Dependent Claim
35 words
The catalyst for purifying exhaust gases according to claim 7, wherein said catalyst support is one selected from the group consisting of a pellet-shaped catalyst support, a monolithic catalyst support and a metal catalyst support.
Claim 13
Dependent Claim
19 words
The catalyst for purifying exhaust gases according to claim 7, wherein said catalyst support is made of a zeolite.
Claim 14
Dependent Claim
41 words
The catalyst for purifying exhaust gases according to claim 7, wherein said zeolite layer comprises at least one zeolite selected from the group consisting of analcimes, soadlites, A type zeolites, faujasites, natrolites, mordenites, heulandites, Y type zeolites, ZSM-5 and synthetic zeolites.
Claim 15
Dependent Claim
43 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and rhodium loaded on said zeolite layer by 0.7 parts by weight or more with respect to 100 parts by weight of said zeolite layer.
Claim 16
Dependent Claim
43 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and rhodium loaded on said zeolite layer by 0.7 parts by weight or more with respect to 100 parts by weight of said zeolite layer.
Claim 17
Dependent Claim
31 words
The catalyst for purifying exhaust gases according to claim 13, wherein said zeolite layer comprises a zeolite having pores whose diameters fall in the range of from 5 to 10 Å.
Claim 18
Dependent Claim
42 words
The catalyst for purifying exhaust gases according to claim 13, wherein said zeolite layer comprises a zeolite which has chemical formula, xM 2/n · Al₂O₃ ySiO₂, wherein the SiO₂ /Al₂ O₃ molar ratio falls in the range of from 10 to 200.
Claim 19
Dependent Claim
35 words
The catalyst for purifying exhaust gases according to claim 13, wherein said catalyst support is one selected from the group consisting of a pellet-shaped catalyst support, a monolithic catalyst support and a metal catalyst support.
Claim 20
Dependent Claim
19 words
The catalyst for purifying exhaust gases according to claim 13, wherein said catalyst support is made of a zeolite.
Claim 21
Dependent Claim
37 words
The catalyst for purifying exhaust gases according to claim 13, wherein said zeolite layer comprises at least one zeolite selected from the group consisting of analcimes, soadlites, type "A" zeolites, faujacites, natrolites, mordenites, heulandites and synthetic zeolites.
Claim 22
Dependent Claim
87 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and at least one of noble metals loaded on said zeolite layer and selected from the group consisting of platinum, palladium and rhodium; wherein said platinum, said palladium and said rhodium are loaded on said zeolite layer by 1.3 parts by weight or more, 0.8 parts by weight or more, and 0.7 parts by weight or more with respect to 100 parts by weight of said zeolite layer, respectively.
Claim 23
Dependent Claim
87 words
A catalyst for purifying exhaust gases comprising: a catalyst support; a zeolite layer formed on said catalyst support; and at least one of noble metals loaded on said zeolite layer and selected from the group consisting of platinum, palladium and rhodium; wherein said platinum, said palladium and said rhodium are loaded on said zeolite layer by 1.3 parts by weight or more, 0.8 parts by weight or more, and 0.7 parts by weight or more with respect to 100 parts by weight of said zeolite layer, respectively.
References Cited (Backward Citations)
No citation records indexed.
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