Title:
車両ポジティブ点火内燃機関用排気システム
Document Type and Number:
Japanese Patent JP2013515902
Kind Code:
A
Abstract:
An exhaust system (10) for a vehicular positive ignition internal combustion engine (12) comprises a filter (20) for filtering particulate matter from exhaust gas emitted from the engine, which filter comprising a porous substrate having inlet surfaces and outlet surfaces, wherein the inlet surfaces are separated from the outlet surfaces by a porous structure containing pores of a first mean pore size, wherein the porous substrate is coated with a three-way catalyst washcoat in combination with other catalytic washcoats selected from the group consisting of a hydrocarbon trap, a NO x absorber, an oxidation catalyst, a selective catalytic reduction (SCR) catalyst, a lean NO x catalyst and combinations of any two or more thereof, which three-way catalyst washcoat comprising a plurality of solid particles wherein the porous structure of the washcoated porous substrate contains pores of a second mean pore size, and wherein the second mean pore size is less than the first mean pore size and a three-way catalyst washcoat disposed on a separate substrate monolith (18) located upstream of the filter, wherein a mass of three-way catalyst washcoat on the upstream substrate monolith is ¤75% of the total mass of three-way catalyst washcoat in the exhaust system.
Inventors:
Louise, Claire, Arnold
Robert, James, Brisley
Neil, Robert, Collins
David, Robert, Greenwell
Christopher, Goff, Morgan
Robert, James, Brisley
Neil, Robert, Collins
David, Robert, Greenwell
Christopher, Goff, Morgan
Application Number:
JP2012545454A
Publication Date:
May 09, 2013
Filing Date:
December 23, 2010
Export Citation:
Assignee:
JOHNSON MATTHEY PUBLIC LIMITED COMPANY
International Classes:
F01N3/023; B01D53/86; B01D53/94; B01J35/04; B01J37/02; F01N3/021; F01N3/035
Domestic Patent References:
| JP2009226375A | 2009-10-08 | |||
| JP2004257267A | 2004-09-16 | |||
| JP2009275584A | 2009-11-26 | |||
| JP2004346877A | 2004-12-09 |
Foreign References:
| WO2009100097A2 | 2009-08-13 |
Attorney, Agent or Firm:
Sonoda Yoshitaka
Kobayashi Yoshinori
Hirohito Katsunuma
Yukitaka Nakamura
Takeshi Katata
Kobayashi Yoshinori
Hirohito Katsunuma
Yukitaka Nakamura
Takeshi Katata