Title:
内燃機関の排ガス浄化方法,排ガス浄化触媒及び排ガス浄化装置
Document Type and Number:
Japanese Patent JP4438114
Kind Code:
B2
Abstract:
The present invention provides a method, device and catalyst to remove nitrogen oxides contained in the exhaust gas of lean-burn automobiles at a high efficiency. NOx and CO adsorbent components are contained in the exhaust gas cleaning catalyst which captures NOx when the air-fuel ratio of exhaust gas is higher than theoretical air-fuel ratio and reduces said captured NOx when the air-fuel ratio of exhaust gas is equal to or smaller than theoretical air-fuel ratio. Said catalyst is placed in the exhaust gas path; said catalyst characterized in that the maximum CO desorption temperature reaches 200 to 220 DEG C when the temperature is raised in He gas flow at the rate of 5 to 10 DEG C/min after CO has been adsorbed by saturation at 100 DEG C; wherein exhaust gas having an air-fuel ratio higher than theoretical air-fuel and exhaust gas having an air-fuel ratio equal to or smaller than theoretical air-fuel ratio are alternately made to flow to said catalyst.
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Inventors:
Hidehiro Iizuka
Kojiro Okude
Masato Kaneda
Nagayama reorganization
Toshio Yamashita
Osamu Kuroda
Yuichi Kitahara
Kojiro Okude
Masato Kaneda
Nagayama reorganization
Toshio Yamashita
Osamu Kuroda
Yuichi Kitahara
Application Number:
JP731399A
Publication Date:
March 24, 2010
Filing Date:
January 14, 1999
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
B01D53/94; B01J21/06; F01N9/00; B01J23/00; B01J23/56; B01J23/58; F01N3/08; F01N3/10; F01N3/20
Domestic Patent References:
| JP7008755A | ||||
| JP8168675A | ||||
| JP2000104534A | ||||
| JP11151439A | ||||
| JP8052365A | ||||
| JP5277369A | ||||
| JP9057098A | ||||
| JP8141394A | ||||
| JP2000054825A |
Attorney, Agent or Firm:
Manabu Inoue