US 11,964,870 B2
Method for preparing carbon nanotubes
Kyung Yeon Kang, Daejeon (KR); Hyun Joon Kang, Daejeon (KR); and Ki Soo Lee, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/059,945
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 22, 2019, PCT No. PCT/KR2019/009042
§ 371(c)(1), (2) Date Nov. 30, 2020,
PCT Pub. No. WO2020/022725, PCT Pub. Date Jan. 30, 2020.
Claims priority of application No. 10-2018-0088008 (KR), filed on Jul. 27, 2018.
Prior Publication US 2021/0214227 A1, Jul. 15, 2021
Int. Cl. C01B 32/162 (2017.01); B01J 21/02 (2006.01); B01J 23/22 (2006.01); B01J 27/25 (2006.01); B01J 31/12 (2006.01); B01J 37/08 (2006.01)
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
OG exemplary drawing
 
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.