Title:
EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2008303791
Kind Code:
A
Abstract:
To restrain SOx from being captured by an NOx reducing catalyst.
An SOx trap catalyst 12 and the NOx reducing catalyst 13 are arranged in an engine exhaust passage. A coat layer composed of at least two layers of an upper coat layer 51 and a lower coat layer 52 is formed on a base body 50 of the NOx reducing catalyst 13. The lower coat layer 52 is formed of an NOx storage catalyst for storing NOx included in exhaust gas when the air-fuel ratio of the exhaust gas is lean and releasing the stored NOx when the air-fuel ratio of the exhaust gas becomes the stoichiometric air-fuel ratio or rich. The upper coat layer 51 is formed of a material having basicity weaker than this NOx storage catalyst.
Inventors:
YOSHIDA KOHEI
ASANUMA TAKAMITSU
NISHIOKA HIROMASA
HIROTA SHINYA
OTSUKI HIROSHI
ASANUMA TAKAMITSU
NISHIOKA HIROMASA
HIROTA SHINYA
OTSUKI HIROSHI
Application Number:
JP2007151876A
Publication Date:
December 18, 2008
Filing Date:
June 07, 2007
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/10; F01N3/08; F01N3/20; F01N3/24
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Jun Tsuruta
Tetsuro Shimada