Title:
EXHAUST GAS CLEANING CATALYST AND EXHAUST GAS CLEANING DEVICE
Document Type and Number:
Japanese Patent JP2001252563
Kind Code:
A
Abstract:
To further improve the reduction efficiency and further cut the NOx amount exhausted without being completely reduced in a stoichiometric-to-rich atmosphere of fuel in the high temperature zone.
A CO modification catalyst is arranged at the upstream side of an exhaust gas flow channel and an NOx occlusion/reduction-type catalyst is arranged at the downstream side of the CO modification catalyst. H2 is formed from CO and H2O contained in an exhaust gas in the stoichiometric-to- rich atmosphere of fuel with the help of the CO modification catalyst. The reduction activity of the formed H2 is extremely higher than that of the HC or CO, so that the reduction efficiency of the NOx by the NOx occlusion/ reduction-type catalyst is enhanced.
Inventors:
HARA NAOYUKI
Application Number:
JP2000066417A
Publication Date:
September 18, 2001
Filing Date:
March 10, 2000
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/08; B01D53/94; B01J23/42; B01J23/44; B01J23/46; B01J23/58; B01J23/745; B01J23/89; F01N3/10; F01N3/28; (IPC1-7): B01J23/58; B01D53/94; B01J23/42; B01J23/44; B01J23/46; B01J23/745; B01J23/89; F01N3/08; F01N3/10; F01N3/28
Attorney, Agent or Firm:
Hiroshi Okawa
Previous Patent: OXYGEN ABSORBENT
Next Patent: EXHAUST GAS CLEANING CATALYST AND MANUFACTURING METHOD THEREFOR
Next Patent: EXHAUST GAS CLEANING CATALYST AND MANUFACTURING METHOD THEREFOR