Methods to reduce alkali material migration from NOx adsorber washcoat to cordierite
First Claim
1. An exhaust gas catalyst system, comprising:
- a substrate; and
a nitrogen oxide adsorber disposed on said substrate, the nitrogen oxides adsorber comprising;
a porous support;
at least one alkali metal barrier; and
a material loaded on said porous support comprising;
a NOx oxidation catalyst; and
at least one alkali material.
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Accused Products
Abstract
An exhaust gas catalyst system, comprising: a substrate; and a nitrogen oxides adsorber deposited on said substrate, the nitrogen oxides adsorber comprising: a porous support; and a material loaded on said porous support comprising: a NO oxidation catalyst, at least one alkali material, and at least one alkali metal barrier.
An exhaust gas catalyst system, comprising: a substrate; an alkali metal barrier layer deposited on said substrate; and a nitrogen oxides adsorber deposited on said alkali metal barrier layer, the nitrogen oxides adsorber comprising: a porous support; and a material loaded on said porous support comprising a NO oxidation catalyst and at least one alkali material.
A method of reducing alkali material migration from a nitrogen oxides adsorber washcoat to a substrate, comprising: depositing on a substrate, an alkali metal barrier layer; and depositing on said alkali metal barrier layer, a nitrogen oxides adsorber composition comprising a material loaded on a porous support, the material comprising a NO oxidation catalyst and at least one alkali material.
A method of reducing alkali material migration from a nitrogen oxides adsorber washcoat to a substrate, comprising: depositing on a substrate, a nitrogen oxides adsorber composition comprising a material loaded on a porous support, the material comprising a NOx oxidation catalyst, at least one alkali material, and at least one alkali metal barrier.
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Citations
38 Claims
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1. An exhaust gas catalyst system, comprising:
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a substrate; and
a nitrogen oxide adsorber disposed on said substrate, the nitrogen oxides adsorber comprising;
a porous support;
at least one alkali metal barrier; and
a material loaded on said porous support comprising;
a NOx oxidation catalyst; and
at least one alkali material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 34, 35, 36, 37, 38)
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17. A method of reducing alkali material migration from a nitrogen oxides adsorber washcoat to a cordierite substrate, comprising:
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depositing an alkali metal barrier layer on a substrate; and
depositing on said alkali metal barrier layer, a nitrogen oxides adsorber composition comprising a NOx oxidation catalyst and at least one alkali material loaded on a porous support.
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29. A method of reducing alkali material migration from a nitrogen oxides adsorber washcoat to a substrate, comprising:
depositing on a substrate, a nitrogen oxides adsorber composition comprising a material loaded on a porous support, the material comprising;
a NOx oxidation catalyst;
at least one alkali material; and
at least one alkali metal barrier.
Specification