Exhaust gas purifying catalyst
First Claim
1. An exhaust gas purifying catalyst comprising:
- a carrier;
a catalyst layer; and
an inhibiting layer formed between said catalyst layer and said carrier;
wherein at least one material selected from a group consisting of alkali metals and alkali earth metals is added to the catalyst layer as an absorbent agent wherein acid material with a high affinity with respect to said absorbent agent is mixed in said catalyst layer; and
wherein the inhibiting layer inhibits movement of said absorbent agent toward said carrier.
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Accused Products
Abstract
The present invention provides an exhaust gas purifying catalyst that is capable of substantially reducing the degree of deterioration in an exhaust gas purifying capability, which results from dissipation of an absorbent agent. Accordingly, an exhaust gas purifying catalyst, which includes a carrier and a catalyst layer, and to which at least one material selected from a group of alkali metals and alkali earth metals is added as an absorbent agent, is characterized in that acid material with a high affinity with respect to the absorbent agent is mixed in the catalyst layer so as to fix the absorbent agent, and an inhibiting layer is formed between the catalyst layer and the carrier so as to inhibit the movement of the absorbent agent toward the carrier.
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Citations
14 Claims
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1. An exhaust gas purifying catalyst comprising:
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a carrier;
a catalyst layer; and
an inhibiting layer formed between said catalyst layer and said carrier;
wherein at least one material selected from a group consisting of alkali metals and alkali earth metals is added to the catalyst layer as an absorbent agent wherein acid material with a high affinity with respect to said absorbent agent is mixed in said catalyst layer; and
wherein the inhibiting layer inhibits movement of said absorbent agent toward said carrier. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing an exhaust gas purifying catalyst comprising:
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forming a carrier;
forming an inhibiting layer on the carrier; and
forming a catalyst layer on the inhibiting layer;
wherein at least one material selected from a group consisting of alkali metals and alkali earth metals is added to the catalyst layer as an absorbent agent wherein acid material with a high affinity with respect to said absorbent agent is mixed in said catalyst layer; and
wherein the inhibiting layer inhibits movement of said absorbent agent toward said carrier. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification