EP0483715A1
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EP
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Use of a catalyst for the elimination of nitrogen oxides from an exhaust gas
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1991-10-28
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Granted: —
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Expires: 2011-10-28
Abstract
Abstract The catalyst for purifying an exhaust gas has at least gallium and a zeolite and an exhaust gas purifying method using the catalyst. Nitrogen oxides in the exhaust gas are reduced and eliminated by the catalyst in an oxidative atmosphere at a reaction temperature of 200 to 800°C and under the presence of a hydrocarbon at the total THC concentration/NO x concentration of from 0.5 to 50.
Inventors
- 👤 Toshiaki c/o IDEMITSU KOSAN CO. LTD. Hayasaka
- 👤 Takuma c/o IDEMITSU KOSAN CO. LTD. Kimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J29/00; B01J29/87; Y; Y02; Y02C; Y02C20/00; Y02C20/10; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
An exhaust gas purifying catalyst for reducing and eliminating a nitrogen oxide in an exhaust gas in an oxidative atmosphere, said catalysts comprising gallium and a zeolite.
Claim 2
Dependent Claim
62 words
An exhaust gas purifying catalyst for reducing and eliminating a nitrogen oxide in an exhaust gas under the presence of a hydrocarbon in an oxidative atmosphere, said catalysts comprising (1) gallium, (2) at least one of ingredients selected from iron, nickel, cobalt, zirconium, manganese, chromium, molybdenum, copper, cerium, titanium, niobium and rare earth elements among the transition elements and (3) a zeolite.
Claim 3
Dependent Claim
48 words
An exhaust gas purifying catalyst for reducing and eliminating a nitrogen oxide in an exhaust gas under the presence of a hydrocarbon in an oxidative atmosphere, said catalysts comprising (1) gallium, (2) at least one of alkali metal elements and alkaline earth metal elements and (3) a zeolite.
Claim 4
Dependent Claim
43 words
An exhaust gas purifying method comprising the steps of bringing an exhaust gas into contact with the catalyst containing gallium and a zeolite under the presence of a hydrocarbon in an oxidative gas, thereby reducing and eliminating nitrogen oxides in said exhaust gas.
Claim 5
Dependent Claim
50 words
An exhaust gas purifying method defined in claim 4, wherein the nitrogen oxides in the exhaust gas are reduced and eliminated at a reaction temperature of from 200 to 800°C and under the presence of a hydrocarbon at a total THC concentration/NO x concentration ratio of from 0.5 to 50.
References Cited (Backward Citations)
EP0060740A1
Cited
WO1991008172A1
Cited
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