Exhaust gas cleaner and method for cleaning exhaust gas
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/34
출원번호
US-0706635
(1996-09-06)
우선권정보
JP-0313637 (1995-11-07)
발명자
/ 주소
Saito Mika,JPX
Yoshida Kiyohide,JPX
출원인 / 주소
Kabushiki Kaisha Riken, JPX
대리인 / 주소
Browdy & Neimark
인용정보
피인용 횟수 :
13인용 특허 :
7
초록▼
An exhaust gas cleaner for removing nitrogen oxides by reduction from an exhaust gas containing nitrogen oxides, sulfur oxides, moisture, unburned or partially burned components and oxygen, a content of oxygen in the exhaust gas being larger than a stoichiometric amount required for completely oxidi
An exhaust gas cleaner for removing nitrogen oxides by reduction from an exhaust gas containing nitrogen oxides, sulfur oxides, moisture, unburned or partially burned components and oxygen, a content of oxygen in the exhaust gas being larger than a stoichiometric amount required for completely oxidizing or burning the unburned or partially burned components, wherein the exhaust gas cleaner consists essentially of a first catalyst consisting essentially of a first porous inorganic oxide carrying at least one silver component, and at least one transition metal component selected from the group consisting of copper, iron, cobalt, nickel and compounds thereof; and a second catalyst selected from the group consisting of (a) a catalyst consisting essentially of a porous titania, (b) a catalyst consisting essentially of a second porous inorganic oxide carrying a titanium component, (c) a catalyst consisting essentially of the second porous inorganic oxide carrying at least one first component selected from the group consisting of copper, nickel, silver, cobalt and compounds thereof, at least one second component selected from the group consisting of titanium, zirconium and compounds thereof, and at least one third component selected from the group consisting of alkali metal elements and rare earth elements, and (d) a catalyst consisting essentially of the second porous inorganic oxide carrying a titanium component and at least one noble metal component selected from the group consisting of platinum, palladium, ruthenium, rhodium, iridium and gold.
대표청구항▼
[ What is claimed is:] [1.] An exhaust gas cleaner for removing nitrogen oxides by reduction from an exhaust gas containing nitrogen oxides, sulfur oxides, moisture, unburned or partially burned components and oxygen, with an oxygen content larger than a stoichiometric amount required for completely
[ What is claimed is:] [1.] An exhaust gas cleaner for removing nitrogen oxides by reduction from an exhaust gas containing nitrogen oxides, sulfur oxides, moisture, unburned or partially burned components and oxygen, with an oxygen content larger than a stoichiometric amount required for completely oxidizing or burning said unburned or partially burned components,said exhaust gas cleaner consisting essentially of a first-stage catalyst disposed adjacent an exhaust gas inlet side and a second-stage catalyst disposed adjacent said exhaust gas outlet side thereof,said first-stage catalyst consisting essentially of a first porous inorganic oxide carrying at least one silver component selected from the group consisting of silver and silver compounds in an amount of 0.2.-15 weight % based on said first porous inorganic oxide, and at least one transition metal component selected from the group consisting of copper, iron, cobalt, nickel and compounds thereof in amount of 0-2 weight % based on said first porous inorganic oxide; andsaid second-stage catalyst consisting essentially of a porous titania.
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이 특허에 인용된 특허 (7)
Yoshimoto Masafumi (Osaka JPX) Nakatsuji Tadao (Osaka JPX) Shimizu Hiromitsu (Osaka JPX), Catalysts and methods for denitrization.
Muramatsu Gyo (Kumagaya JPX) Yoshida Kiyohide (Kumagaya JPX) Sumiya Satoshi (Kumagaya JPX) Abe Akira (Kumagaya JPX), Exhaust gas cleaner and method of cleaning exhaust gas catalyst for cleaning exhaust gas.
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