SELECTIVE NOx REDUCTION CATALYST - TOYOTA MOTOR CO LTD

Title:

SELECTIVE NOx REDUCTION CATALYST

Document Type and Number:

WIPO Patent Application WO/2015/125496

Kind Code:

A1

Abstract:

A NOx catalyst is provided that can realize a favorable NOx reduction in a broad temperature region and that can lighten the overhead involved in production. The NOx catalyst has active components exhibiting a selective reduction activity for NOx, wherein the active components exhibiting the selective reduction activity contains a high-temperature active component having a relatively high NOx reduction activity at high temperatures and a low-temperature active component having a relatively high NOx reduction activity at low temperatures; and the high-temperature active component and the low-temperature active component are disposed in a mixed state in a primary particle of the catalyst particle, and an active component ratio on a surface side of the primary particle is larger than an active component ratio on an interior side of the primary particle, with the active component ratio being is a ratio of a concentration of the high-temperature active component to a concentration of the low-temperature active component in the primary particle.

Inventors:

OTSUKI HIROSHI (JP)
NISHIOKA HIROMASA (JP)
TSUKAMOTO YOSHIHISA (JP)
NOTAKE YASUMASA (JP)

Application Number:

PCT/JP2015/000882

Publication Date:

August 27, 2015

Filing Date:

February 23, 2015

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)

International Classes:

B01D53/94; B01J29/064; B01J37/30; F01N3/20

Domestic Patent References:

WO2013126619A1

2013-08-29

Foreign References:

EP0376025A1	1990-07-04
EP1967264A1	2008-09-10
US20120039759A1	2012-02-16
EP2327477A1	2011-06-01
EP2308596A1	2011-04-13
JP2008221203A	2008-09-25
JP2010000499A	2010-01-07
JP2011125849A	2011-06-30
JP2013013894A	2013-01-24
JP2011167690A	2011-09-01

Other References: