Process for preparing materials for reaction layer of gas permea

Details Process for preparing materials for reaction layer of gas permea Process for preparing materials for reaction layer of gas permea

1987-04-03

1989-03-28

Niebling, John F.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Making catalytic electrode, process only

204282, 204283, 204294, 429 13, 429 42, H01M 488

Patent

active

048164313

ABSTRACT:
Disclosed herein are processes for preparing a raw material dispersion and raw material powders for producing reaction layers of a gas permeable electrode. The raw materials are prepared in one aspect of the invention by mixing fine particles containing a surface-active agent, freezing the mixture to a temperature at which the surface-active agent loses at least part of its function and then thawing out the same. The resulting material exhibits superior catalytic performance because the particles are dispersed uniformly by the lack of function of the surface-active agent at the time of freezing.
The raw materials are prepared in another aspect of the invention by mixing hydrophilic minute particles coated with an ion exchange resin, PTFE and hydrophobic fine powders. The resulting material exhibits superior catalytic performance because catalysts contained in the hydrophilic minute particles are neither liberated nor made to flow so that the initial catalytic activities are substantially maintained even after a relatively long period of use.

REFERENCES:
patent: 3932197 (1976-01-01), Katz et al.
patent: 4444852 (1984-04-01), Liu et al.

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