PURPOSE: To obtain a fibrous magnetite excellent in carbon dioxide decomposition ability, high in porosity and providing a catalyst free from the degradation of catalytic efficiency due to pressure loss by coating the surface of a fibrous base material with a specific reductive magnetite.
CONSTITUTION: The surface of the fibrous base material such as silicon nitride fiber, aluminum nitride fiber or titanium oxide fiber is coated with an oxygen containing iron compound such as magnetite, maghemite by wet process or vapor phase chemical reaction process. Next, by reducing the coated oxygen containing iron compound by hydrogen reduction method or the like, the fibrous magnetite coated with the reductive magnetite expressed by Fe3O4-x (0<x≤0.5) on the surface of the fibrous base material is obtained. The obtained fibrous magnetite is useful for a catalyst for decomposing carbon dioxide and for a base material for a fuel cell in the case of using a electric conductive one as the fibrous base material.
MIZOBUCHI HARUE
NISHIUCHI KIHACHIRO
MORIMOTO TAKURO
