Metal oxide-platinum compound catalyst and method for producing same

Patent metadata

Field	Value
Publication number	US-8980786-B2
Application number	US-201114006766-A
Country	US
Kind code	B2
Filing date	Aug 8, 2011
Priority date	Mar 24, 2011
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

The present invention relates to a metal oxide-platinum compound catalyst comprising 5 to 95 parts by weight of a metal oxide and 95 to 5 parts by weight of platinum as the balance. The platinum has a form to reticulately cover at least a part of a particle of the metal oxide. The wires constituting the platinum mesh have an average wire diameter of 5 nm or smaller.

First claim

The invention claimed is:

1. A metal oxide-platinum composite catalyst, comprising:
5 to 95 parts by weight of a metal oxide; and
95 to 5 parts by weight of platinum as the balance to the metal oxide,
wherein the platinum has a form of wires constituting a mesh to reticulately cover at least a part of a particle of the metal oxide; and
the wires constituting the platinum mesh have an average wire diameter of 5 nm or smaller.

2. The metal oxide-platinum composite catalyst according to claim 1 ,
wherein a fluoro group-containing compound or an alkyl group-containing compound is adsorbed on a surface of the metal oxide, or a reaction product of the compound with the metal oxide is formed thereon.

3. The metal oxide-platinum composite catalyst according to claim 1 ,
wherein the metal oxide is one or two or more metal oxides selected from silica, zirconia and ceria.

4. The metal oxide-platinum composite catalyst according to claim 1 ,
wherein the metal oxide-platinum composite catalyst has a surface having an average contact angle to water of 15 degrees or larger.

5. A method for manufacturing the metal oxide-platinum composite catalyst according to claim 1 , comprising:
a dispersion step of dispersing a metal oxide in a dispersion medium;
a dissolution step of dissolving chloroplatinic acid in a solvent containing ethylenediamine;
a raw material solution preparation step of mixing the metal oxide dispersion solution obtained by the dispersion step and the chloroplatinic acid solution obtained by the dissolution step to thereby prepare a raw material solution;
a spray step of spraying the raw material solution on a base material heated to 60 to 200 degrees C.;
a recovery step of recovering a metal oxide-platinum composite containing the metal oxide and the platinum from the base material; and
a baking step of baking the recovered metal oxide-platinum composite under a reducing atmosphere at a temperature equal to or higher than the temperature of the base material in the spray step and 300 degrees C. or lower.

6. The method for manufacturing a metal oxide-platinum composite catalyst according to claim 5 ,
further comprising, after the recovery step, a hydrophobization step in which an alkylsilane compound or an alkoxysilane compound is adsorbed on a surface of the metal oxide-platinum composite, or a reaction product of the compound with the metal oxide is formed thereon.

7. The method for manufacturing a metal oxide-platinum composite catalyst according to claim 6 ,
wherein the hydrophobization step uses a fluoro group-containing or alkyl group-containing alkylsilane compound or alkoxysilane compound.

Assignees

• Murakami Yasushi
• Shimizu Wataru
• Okada Kazuyoshi
• Univ Shinshu

Inventors

• Murakami Yasushi
• Shimizu Wataru
• Okada Kazuyoshi

Classifications

• B01J37/0217

  Pretreatment of the substrate before coating · CPC title

• B01J35/006

  Operations & Transport · mapped topic

• H01M4/925

  supported on carriers, e.g. powder carriers · CPC title

• B01J35/002

  Operations & Transport · mapped topic

• B01J37/0045

  Drying a slurry, e.g. spray drying · CPC title