Patent ID: 8202818

Claim:
A catalyst composition for preparing carbon nanotube represented by following formula: [CO x V y M1 z ] p M2 q wherein Co represents catalytic metal of cobalt, its oxide or its derivative; V represents catalytic metal of vanadium, its oxide or its derivative; M1 represents at least one catalytic transition metal selected from Al, Fe, Ni, W, Cr, Mn, Sn, Cu, Y, Zr, Ti, Mo or Si, its oxide or its derivative; M2 represents inactive porous support selected from Mg or Si, its oxide or its derivative; p and q represent mole fraction of catalytic metal and inactive porous support, respectively; p+q= 1, 0.05 ≦p≦ 0.95, 0.05 ≦q≦ 0.95; x, y and z represent mole fraction of Co, V and M1, respectively; x+y+z= 1, 0.03 ≦x≦ 0.75, 0.02 ≦y≦ 0.75, 0.01 ≦z≦ 0.95.