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Method for reduction of nitrogen oxides with ammonia using promoted zeolite catalysts

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B01J-008/00    C01B-021/00   
미국특허분류(USC) 423/239
출원번호 US-0341405 (1989-04-20)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 159  인용 특허 : 4
초록
▼

A method in accordance with the invention comprises passing through a zeolite catalyst as described below, a gaseous stream containing nitrogen oxides, ammonia and oxygen to selectively catalyze the reduction of nitrogen oxides and, if excess or unreacted ammonia is present, to oxidize the excess of unreacted ammonia with oxygen to hydrogen and water. The method includes the use of a zeolite catalyst composition which comprises a metal (e.g., iron or copper) promoted zeolite, the zeolite being characterized by having a silica to alumina ratio of at least...

대표
청구항
▼

A method for the reduction of nitrogen oxides with ammonia which comprises: contacting a gaseous stream containing nitrogen oxides and ammonia at a temperature of from about 250°C. to 600°C. with a catalyst composition comprising: (a) a zeolite having a silica to alumina ratio of at least about 10, and a pore structure which is interconnected in all three crystallographic dimensions by pores having an average kinetic pore diameter of at least about 7 Angstroms; and (b) a promoter selected from the group consisting of iron and copper in the amount of from...

이 특허에 인용된 특허 (4)

  1. Nishikawa ; Eiichiroh ; Itoh ; Takuji ; Maeshima ; Tsugio ; Kamiyama ; S etsuo. Catalyst for reduction of nitrogen oxides and process for preparing the sam e. USP1978084104361.
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  3. Kittrell James R. (Amherst MA) Herman Donald L. (Coventry RI). Process for reducing nitric oxides. USP1984094473535.
  4. Pence Dallas T. (Idaho Falls ID) Thomas Thomas R. (Idaho Falls ID). Reduction of nitrogen oxides with catalytic acid resistant aluminosilicate molecular sieves and ammonia. USP1980094220632.

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