▎ 摘　　要

NOVELTY - A graphene-laminated nanocarbon has ion-exchange capacity of 0.1-15 meq/g. USE - Graphene-laminated nanocarbon is used for e.g. field-emission-type electron-emitting element, probe for scanning probe microscope, structure reinforcing material, and electrode of battery and sensor. ADVANTAGE - The graphene-laminated nanocarbon has excellent dispersibility. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) catalyst, which contains porous composite metal oxide including metal oxide (a) chosen from oxide of magnesium, calcium and aluminum, and 50-95 %mass of metal-oxide (b) chosen from oxide of nickel, iron, and cobalt, and having particle diameter of 8-100 nm; (2) manufacture of catalyst, which involves reacting magnesium nitrate, calcium nitrate and/or aluminum nitrate, nickel nitrate, iron nitrate and/or cobalt nitrate, glycine, and ion-exchange water, and baking in air atmosphere; and (3) manufacture of graphene-laminated nanocarbon, which involves supplying hydrocarbon gas chosen from ethylene, acetylene, propane, propylene, isoprene and n-butane, and porous composite metal oxide to reaction tube installed in furnace having catalytic activation zone, nanocarbon synthetic zone, and cooling zone.