EP0488250A1
Expired / Lapsed
EP
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Method for catalytically purifying exhaust gas
Assignee: Toyota Motor Corp
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Filing: 1991-11-27
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Granted: —
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Expires: 2011-11-27
Abstract
Abstract A method for purifying an oxygen excess exhaust gas by catalytically reducing nitrogen oxides contained in the exhaust gas, which comprises bringing a catalyst comprising at least one noble metal supported on a carrier composed mainly of an oxide or a complex oxide of at least one metal selected from rare earth metals and metals of the group IV A of the periodic table of elements into contact the exhaust gas.
Inventors
- 👤 Hideaki c/o Toyota Jidosha K.K. Muraki
- 👤 Tokuta c/o Toyota Jidosha K.K. Inoue
- 👤 Kiyohiko c/o Toyota Jidosha K.K. Oishi
- 👤 Kenji C/O Toyota Jidosha K.K. Katoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:06
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1025; B01D2255/20; B01D2255/206; B01D2255/2063; B01D2255/2065; B01D2255/207; B01D2255/20715; B01D2255/20746; B01D2255/20769; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A method for purifying an oxygen excess exhaust gas by catalytically reducing nitrogen oxides contained in the exhaust gas, which comprises bringing a catalyst comprising at least one noble metal supported on a carrier composed mainly of an oxide or a complex oxide of at least one metal selected from the group consisting of rare earth metals and metals of the group IV A of the periodic table of elements into contact with the exhaust gas.
Claim 2
Dependent Claim
26 words
A method as claimed in claim 1, wherein the noble metal is at least one metal selected from the group consisting of platinum, palladium and rhodium.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1, wherein the rare earth metals are La, Ce, Pr, Nd and Sm.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, wherein the metals of group IV A are Ti, Zr and Hf.
Claim 5
Independent Claim
70 words
A method for purifying an oxygen excess exhaust gas by catalytically reducing nitrogen oxides contained in the exhaust gas, which comprises bringing a catalyst comprising an oxide or a complex oxide of at least one metal selected from the group consisting of rare earth metals and metals of the group IV A of the periodic table of elements and at least one noble metal, supported on a carrier comprising alumina.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 5, wherein the noble metal is at least one metal selected from the group consisting of platinum, palladium and rhodium.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 5, wherein the rare earth metals are La, Ce, Pr, Nd and Sm,
Claim 8
Dependent Claim
19 words
A method as claimed in claim 5, wherein the metals of group IV A are Ti, Zr and Hf.
References Cited (Backward Citations)
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