Noble metal fine particle supported catalyst and method for producing the catalyst, and purifying catalyst
First Claim
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1. A noble metal fine particle supported catalyst comprising a substrate;
- and a porous membrane formed on the substrate,wherein the porous membrane comprises support particles, noble metal fine particles, and an inorganic binder,in the porous membrane, the noble metal fine particles are supported on surfaces of the support particles, and a plurality of the support particles on which the noble metal fine particles are supported form a secondary particle having a porous structure, andthe porous membrane is formed by binding, with the inorganic binder, a plurality of the secondary particles formed of the support particles on which the noble metal fine particles are supported so that a gap is present at least partly between the secondary particles adjacent to each other.
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Abstract
The noble metal fine particle supported catalyst of the present invention includes a substrate, and a porous membrane formed on the substrate. The porous membrane contains support particles, noble metal fine particles, and an inorganic binder. In the porous membrane, the noble metal fine particles are supported on surfaces of the support particles, and the support particles form secondary particles each having a porous structure. The porous membrane is formed by binding, with the inorganic binder, the secondary particles formed of the support particles so that a gap is present at least partly between the secondary particles adjacent to each other.
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Citations
19 Claims
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1. A noble metal fine particle supported catalyst comprising a substrate;
- and a porous membrane formed on the substrate,
wherein the porous membrane comprises support particles, noble metal fine particles, and an inorganic binder, in the porous membrane, the noble metal fine particles are supported on surfaces of the support particles, and a plurality of the support particles on which the noble metal fine particles are supported form a secondary particle having a porous structure, and the porous membrane is formed by binding, with the inorganic binder, a plurality of the secondary particles formed of the support particles on which the noble metal fine particles are supported so that a gap is present at least partly between the secondary particles adjacent to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- and a porous membrane formed on the substrate,
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14. A method for producing a noble metal fine particle supported catalyst, comprising steps of:
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bringing a dispersion of noble metal fine particles into contact with support particles having an average particle diameter from 10 nm to 100 nm so that the noble metal fine particles are supported on the support particles; mixing the support particles on which the noble metal fine particles are supported with a solvent so as to form a mixture, and stirring the resultant mixture so as to produce a dispersion of the support particles so that a plurality of the support particles on which the noble metal fine particles are supported form a secondary particle having an average particle diameter from 10 nm to 1000 nm; producing a coating liquid by mixing the dispersion of the support particles with a metal oxide forming sol that forms an inorganic binder; applying the coating liquid to a substrate; and drying and heat-treating the substrate on which the coating liquid is applied, wherein a porous membrane comprises the noble metal fine particle;
the support particles; and
the inorganic binder,the porous membrane is formed on the substrate by binding, with the inorganic binder, the secondary particles that are formed of the support particles on which the noble metal fine particles are supported and are adjacent to each other, and binding the support particles to the substrate with the inorganic binder, so that a gap is present at least partly between the secondary particles adjacent to each other. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification