Patent ID: 8530374

Claim:
A catalyst body for production of carbon nanostructure, comprising a substrate, a reaction preventive layer formed on a surface of said substrate, and a catalyst layer on said reaction preventive layer, wherein said carbon nanostructure which is produced by using said catalyst body is a brush-shaped carbon nanostructure, said reaction preventive layer is formed by one selected from the group consisting of silicon carbide and silicon oxide, said catalyst layer is a catalyst particle layer comprising metallic catalyst particles that contain a catalyst metal as a main component, and when a half width of the particle size distribution of said metallic catalyst particles is defined as ΔD, a ratio ΔD/D of the said half width ΔD with respect to a mean particle size D of said metallic catalyst particles is within a range of 0<ΔD/D≦0.7, a number per unit area of said metallic catalyst particles forming said catalyst layer is greater than 1×10 8 /cm 2 , and said catalyst particle layer includes at least iron oxide catalyst particles comprising Fe 3 O 4 .