CPC C01B 32/162 (2017.08) [B01J 21/02 (2013.01); B01J 23/22 (2013.01); B01J 27/25 (2013.01); B01J 31/122 (2013.01); B01J 37/08 (2013.01); C01P 2004/13 (2013.01); C01P 2004/64 (2013.01); C01P 2006/12 (2013.01)] | 12 Claims |
1. A method for preparing carbon nanotubes, the method comprising:
preparing a support comprising AlO(OH) by primary heat treatment of Al(OH)3;
preparing an active carrier by supporting a mixture including a main catalyst precursor and a cocatalyst precursor on the support;
drying the active carrier through multi-stage drying including vacuum drying, wherein the multi-stage drying comprises primary drying which is carried out at 80 to 160° C. and secondary drying which is carried out at 175 to 300° C.;
preparing a supported catalyst by secondary heat treatment of the dried active carrier; and
preparing carbon nanotubes in the presence of the supported catalyst;
wherein the primary drying is carried out such that solvent present is removed from the active carrier,
and wherein the secondary drying is carried out such that a coordination compound of the main catalyst is decomposed and discharged.
|