▎ 摘　　要

NOVELTY - Apparatus (34) comprises an electric arc furnace and a feeder that directs solid carbon dioxide into an electrical arc generated by the electric arc furnace. USE - The apparatus is useful for producing high yields of carbon nanostructures without forming magnesium oxide (claimed), where the carbon nanostructures include buckminsterfullerenes, carbon nanotubes and graphene including multilayer graphene. ADVANTAGE - The apparatus utilizes the control system which maximizes a synthesis rate of carbon nanostructures, and favors the production of carbon nanotubes and graphene over other nanostructures by a predetermined ratio without producing magnesium oxide (all claimed). DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional view of the apparatus for producing carbon nanostructures. Apparatus (34) Vessel (36) Conduit (38) Gas source (60) Control system (64)