Hisatsugu Kaji

Process for preparing a fuel cell electrode substrate comprising carbon fibers

An electrode substrate for a fuel cell having a high porosity, a good mechanical strength and electroconductivity and a sharp distribution of pore radii is prepared by a process comprising mixing 30 to 50% by weight of carbon fiber, 20 to 50% by weight of a binder and 20 to 50% by weight of an organic granule, press-shaping the resultant mixture, curing the shaped product and calcinating the cured product.

Method for producing spherical particles of carbon and of activated carbon

A method for producing spherical particles of carbon and of activated carbon is described, in which a mixture of a pitch and a viscosity-reducing agent is melt-extruded into a form of string-like bodies, the thus obtained string-like bodies are broken into stick-like bodies of a length to diameter ratio of 1 to 5 and the stick-like bodies are thermally deformed utilizing hot water as a thermal medium into spherical particles. The spherical particles are then subjected to conventional extraction to remove the viscosity-reducing agent therefrom, and the thus obtained spherical particles of pitch are converted into spherical particles of carbon or of activated carbon.