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US 2015/0086906 A1Published application
Porous clusters of silver powder promoted by zirconium oxide for use as a catalyst in gas diffusion electrodes, and method for the production thereof
AssigneeBar-Ilan University
InventorsErnst Khasin, Arie Zaban
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Abstract
A catalyst including: a plurality of porous clusters of silver particles, each cluster of the clusters including: (a) a plurality of primary particles of silver, and (b) crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of the crystalline particles of ZrO2 is located in pores formed by a surface of the plurality of primary particles of silver.
Claims13
A catalyst comprising:
- a plurality of porous clusters of silver particles, each cluster of said clusters including a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles, wherein said primary particles have an average size 20 to 100 nanometers, the pores in said porous clusters have an average characteristic diameter of 15 to 250 nanometers and the crystalline particles of ZrO2 have an average particle size of less than about 50 nanometers.
A catalyst comprising:
- a plurality of porous clusters of silver particles, each cluster of said clusters including a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles, wherein said clusters of silver particles have an average size in the range of 1 to 50 microns.
A catalyst comprising:
- a plurality of porous clusters of silver particles, each cluster of said clusters including a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles, wherein the concentration of the crystalline particles of zirconium oxide in the catalyst is between 1% and 6% by weight.
A catalyst comprising:
- a plurality of porous clusters of silver particles, each cluster of said clusters including a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles, wherein the B.E.T specific surface area of the catalyst is in the range of 3 to 16 square meters per gram.
A catalyst comprising:
- a plurality of porous clusters of silver particles, each cluster of said clusters including a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles, wherein the average agglomerate porosity of the catalyst is in the range of 30% to 50%.
A catalyst comprising:
- a plurality of porous clusters of silver particles, each cluster of said clusters including a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles, wherein the tap density of the catalyst is in the range of 1 to 3 g/cc.
A method of producing an air electrode comprising:
- a catalyst having a plurality of porous clusters of silver particles, each cluster of said clusters comprising a plurality of primary particles of silver and crystalline particles of zirconium oxide (ZrO2), wherein at least a portion of said crystalline particles of ZrO2 is located in pores formed by a surface of said plurality of primary particles;
- a water-repellant polymer;
- a current collector;
- and
- a porous hydrophobic film,
- wherein said catalyst, said water-repellant polymer and said current collector are located on a single broad face of said porous hydrophobic film, said method comprising:
- mixing said catalyst with a water-repellant polymer to form an active mix;
- placing said active mix, said current collector and said hydrophobic film into a die of a press-mold;
- compacting said components;
- and
- sintering said components.
8 more elements
Dependencies are inferred from the claim text.