Title:
選択還元型触媒を用いた排気ガス浄化装置及び排気ガス浄化方法
Document Type and Number:
Japanese Patent JP5769708
Kind Code:
B2
Abstract:
An exhaust gas purification catalyst apparatus using a selective reduction-type catalystwhichiscapable ofeffectively purifying a nitrogen oxide even at low temperature, as well as suppressing leakage of ammonia, in technology for purifying a nitrogen oxide contained in exhaust gas discharged from a lean burn engine such as a diesel engine, with ammonia and the selective reduction catalyst, and a method for exhaust gas purification. An exhaust gas purification catalyst apparatus arranged with a spraying means of a reducing agent selected from ammonia or urea, and two selective reduction-type catalysts (SROC) in series, in a flow passage of exhaust gas of a lean burn engine, to oxidize nitrogen monoxide (NO) in exhaust gas, as well as to reduce a nitrogen oxide by the reducing agent which is sprayed in exhaust gas, to oxidize excess ammonia, characterized in that: the selective reduction-type catalyst (SROC) has a lower catalyst layer (A) and an upper catalyst layer (B) at the surface of an integral structure-type carrier (C), wherein the lower catalyst layer (A) contains the following components (i) a noble metal component, component (ii) alumina, titania, silica, zirconia, tungsten oxide, a transition metal oxide, a rare earth oxide, and a complex oxide thereof, and component (iii) zeolite; on the other hand, the upper catalyst layer (B) does not substantially contain the following component (i) and contains the following component (iii); the component (i) of the lower catalyst layer (A1) of the selective reduction-type catalyst (SROC1) at the forward stage contains a platinum component in an amount of 90% by weight or more in metal equivalent; and the component (i) of the lower catalyst layer (A2) of the selective reduction-type catalyst (SROC2) at the backward stage contains a palladium component in an amount of 40% by weight or more inmetal equivalent; or the like.
Inventors:
Ryuji Ando
Taiji Sugano
Makoto Nagata
Taiji Sugano
Makoto Nagata
Application Number:
JP2012522507A
Publication Date:
August 26, 2015
Filing Date:
May 17, 2011
Export Citation:
Assignee:
NE Chemcat Co., Ltd.
International Classes:
B01J29/76; B01D53/86; B01J23/42; B01J23/44; F01N3/08; F01N3/10; F01N3/24; F01N3/28
Domestic Patent References:
| JP2008279334A | 2008-11-20 | |||
| JP2009538724A | 2009-11-12 | |||
| JP2009221913A | 2009-10-01 | |||
| JP2006326437A | 2006-12-07 | |||
| JP2010104898A | 2010-05-13 | |||
| JP2008279334A | 2008-11-20 | |||
| JP2009538724A | 2009-11-12 | |||
| JP2009221913A | 2009-10-01 | |||
| JP2006326437A | 2006-12-07 | |||
| JP2010104898A | 2010-05-13 |
Foreign References:
| US20110058999A1 | 2011-03-10 | |||
| US20110058999A1 | 2011-03-10 |
Attorney, Agent or Firm:
Kenji Kawabi