Catalyst composition for the synthesis of thin multi-walled carbon nanotube and its manufacturing method

A catalyst composition for producing carbon nanotube represented by following formula.

• [Fea:Alb[x:My:Mgz
• wherein
• Fe represents catalytic metal of iron, its oxide, or its derivative;
• Al represents catalytic metal of aluminum, its oxide, or its derivative;
• Mg represents inactive support of magnesium, its oxide, or its derivative;
• M represents at least one transition metal selected from Co, Ni, Cr, Mn, Mo, W, V, Sn, or Cu, its oxide, or its derivative.
• x, y, and z represent molar fraction of [the sum of Fe and Al], M, and Mg,
• x+y+z=10, 2.0≦x≦8.0, 0.0≦y≦2.5, 0.5≦z≦8.0.
• a and b represent molar fraction of Fe and Al,
• a+b=10, 2.0≦a≦5.5, 4.5≦b≦8.0.