Title:
CATALYST FOR REDUCING QUANTITY OF NOX IN LEAN EXHAUST GAS OF MOTOR VEHICLE ENGINE AND METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3502408
Kind Code:
B2
Abstract:
PURPOSE: To provide a simple and efficient catalyst for cleaning an exhaustion gas of motor vehicle engines capable of converting nitrogen oxides at a low exhaustion temperature, and to provide a method therefor.
CONSTITUTION: The catalyst contains a first catalytic coating having iridium and platinum with noble metal components within a wt.% range of (1:10) to (10:1), and a second coating layer of a thermally stable zeolite on the first coating layer, and contains a zeolite of mordenite type containing copper and/or iron and its support is composed of a rare earth metal and/or silicon dioxide. The catalyst is useful for cleaning an exhaustion gas of a diesel engine or an Otto engine.
Inventors:
Jürgen Reyler
Egbert Rocks
Bernd Engler
Egbert Rocks
Bernd Engler
Application Number:
JP4348493A
Publication Date:
March 02, 2004
Filing Date:
March 04, 1993
Export Citation:
Assignee:
Degussa Actien Gezel Shaft
International Classes:
B01D53/56; B01D53/86; B01D53/94; B01J29/06; B01J29/24; B01J35/04; B01J37/02; F02B1/04; (IPC1-7): B01J29/24; B01D53/94; B01J35/04; B01J37/02
Domestic Patent References:
| JP1127044A | ||||
| JP4197446A |
Attorney, Agent or Firm:
Toshio Yano (4 outside)