Catalyst for purifying an exhaust gas and process for producing the same
First Claim
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1. A catalyst for purifying an exhaust gas, comprising:
- a composite oxide support having a spinel structure expressed by M.Al2O4 in which M is an alkaline-earth metal; and
a platinum structural layer formed on a surface of said composite oxide support and including a matrix composed mainly of an alkaline-earth metal oxide in which platinum clusters are dispersed uniformly, a particle diameter of said platinum clusters being 10 nm or less.
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Abstract
A catalyst for purifying an exhaust gas includes a composite oxide support and a platinum structural layer. The composite oxide support has a spinel structure expressed by M.Al2O4 in which M is an alkaline-earth metal. The platinum structural layer is formed on a surface of the composite oxide support and includes a matrix composed mainly of an alkaline-earth metal oxide in which platinum clusters are dispersed uniformly. A composite oxide layer can be interposed between the composite oxide support and the platinum structural layer. Also disclosed is an optimum process for producing the catalyst.
25 Citations
9 Claims
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1. A catalyst for purifying an exhaust gas, comprising:
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a composite oxide support having a spinel structure expressed by M.Al2O4 in which M is an alkaline-earth metal; and
a platinum structural layer formed on a surface of said composite oxide support and including a matrix composed mainly of an alkaline-earth metal oxide in which platinum clusters are dispersed uniformly, a particle diameter of said platinum clusters being 10 nm or less. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A catalyst for purifying an exhaust gas, comprising:
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a composite oxide support having a spinel structure expressed by M.Al2O4 in which M is an alkaline-earth metal;
a composite oxide layer formed on a surface of said composite oxide support containing at least two kinds of an alkaline-earth metal comprising the M contained in said composite oxide support and an alkaline-earth metal other than the M; and
a platinum structural layer formed on a surface of said composite oxide layer and including a matrix composed mainly of an alkaline-earth metal oxide in which platinum clusters are dispersed uniformly. - View Dependent Claims (8, 9)
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Specification