US 8,323,579 B2Granted

S storage catalyst and exhaust-gas converting apparatus

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsYoshitsugu Ogura, Takayuki Endo

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Abstract

An S storage catalyst 2 is equipped with a catalytic supporter, a catalytic metal being supported on this catalytic supporter and oxidizing SO2 to SO3, and an S storage material being supported on the catalytic supporter and storing S components therein. This S storage catalyst 2 has an exhaust-gas-inlet-side high-concentration portion 2A in which the S storage material is supported on the catalytic supporter in a high concentration, and an exhaust-gas-outlet-side low-concentration portion 2A in which the S storage material is supported on the catalytic supporter in a low concentration that is lower than that of the high-concentration portion. In accordance with this S storage catalyst 2, it is possible to maintain the S storing performance favorably, even in a case where exhaust-gas temperatures are low, while keeping the material cost from rising steeply.

Claims4

Dependent claims

An S storage catalyst equipped with:

a catalytic supporter;
a catalytic metal being supported on the catalytic supporter and oxidizing SO2 to SO3;
and an S storage material being supported on the catalytic supporter and storing S components therein;
and wherein:
an exhaust-gas-inlet-side high-concentration portion in which said S storage material is supported on said catalytic supporter in a high concentration;
and an exhaust-gas-outlet-side low-concentration portion in which said S storage material is supported on said catalytic supporter in a low concentration that is lower than that of the high-concentration portion;
wherein a relationship “L”/15≦“L1”<“L”/3 is satisfied, wherein L is an overall length of the S storage catalyst in an exhaust-gas flowing direction, and wherein L1 is a length of said high-concentration portion in the exhaust-gas flowing direction, and a supporting amount of said S storage material at said high-concentration portion is 0.2-0.4 mol/liter.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/599,815Filed 13 May 2008
Priority: JP 2007-13315618 May 2007
Published: US 2010/0205947 A119 Aug 2010
Granted: 4 Dec 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification23 codes

B01J 23/58
Platinum group metals: with alkali- or alkaline earth metals
B01J 35/19
Catalysts, in general, characterised by their form or physical properties: catalysts containing parts with different compositions
B01J 37/0242
Multiple impregnation or coating: coating followed by impregnation
F01N 3/0814
By using absorbents or adsorbents: combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts