Patent ID: 8048821

Claim:
A catalyst composition for producing carbon nanotube represented by following formula [Fe a :Al b ] x :M y :Mg z wherein Fe represents catalytic metal of iron, its oxide; Al represents catalytic metal of aluminum, its oxide; Mg represents inactive support of magnesium, its oxide; M represents at least one transition metal selected from Co, Ni, Cr, Mn, Mo, W, V, Sn, or Cu, its oxide; 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.