US 9,809,458 B2
Method for controlling bulk density of carbon nanotube agglomerate
SungJin Kim, Daejeon (KR); Seungyong Son, Daejeon (KR); Dong Hyun Cho, Daejeon (KR); KyungYeon Kang, Daejeon (KR); Jinmyung Cha, Daejeon (KR); and Jihee Woo, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 14/438,816
Filed by LG CHEM. LTD., Seoul (KR)
PCT Filed Sep. 30, 2014, PCT No. PCT/KR2014/009231
§ 371(c)(1), (2) Date Apr. 27, 2015,
PCT Pub. No. WO2015/047048, PCT Pub. Date Apr. 2, 2015.
Claims priority of application No. 10-2013-0116963 (KR), filed on Sep. 30, 2013; application No. 10-2014-0072553 (KR), filed on Jun. 16, 2014; application No. 10-2014-0129411 (KR), filed on Sep. 26, 2014; and application No. 10-2014-0129449 (KR), filed on Sep. 26, 2014.
Prior Publication US 2015/0298974 A1, Oct. 22, 2015
Int. Cl. C01B 31/02 (2006.01); B01J 23/745 (2006.01); B01J 37/08 (2006.01); B01J 23/847 (2006.01); B01J 21/18 (2006.01); B01J 23/70 (2006.01); B01J 35/00 (2006.01); C01B 32/158 (2017.01); C01B 32/162 (2017.01); B01J 23/22 (2006.01); B01J 23/28 (2006.01); B01J 23/88 (2006.01); B01J 23/887 (2006.01)
CPC C01B 31/0233 (2013.01) [B01J 21/185 (2013.01); B01J 23/70 (2013.01); B01J 23/745 (2013.01); B01J 23/8472 (2013.01); B01J 35/0026 (2013.01); B01J 37/08 (2013.01); C01B 32/158 (2017.08); C01B 32/162 (2017.08); B01J 23/22 (2013.01); B01J 23/28 (2013.01); B01J 23/88 (2013.01); B01J 23/8877 (2013.01); C01B 2202/22 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for producing a carbon nanotube aggregate, comprising:
calcining aluminum hydroxide at a primary calcination temperature of 300° C. to 500° C. to form a support comprising 40 wt % or more of AlO(OH),
impregnating a catalytic metal precursor on the support,
calcining the catalyst-containing support at a secondary calcination temperature of 550° C. to 800° C. to obtain a supported catalyst, and
bringing the supported catalyst into contact with a carbon-containing compound under heating to react with each other,
wherein the primary calcination temperature, the secondary calcination temperature, the amount of the catalyst supported or the reaction time is controlled such that the carbon nanotube aggregate has a bulk density of 10 kg/m3 or more and less than 80 kg/m3,
wherein the catalytic metal comprises cobalt (Co) and vanadium (V),
wherein at least a portion of the carbon nanotube aggregate is of a bundle type, and
wherein the method further comprises adding an organic acid such that the molar ratio of cobalt (Co) to organic acids is from 5.8:1 to 30:1 during the preparation of the supported catalyst, and the bulk density of the carbon nanotube aggregate is controlled by varying the amount of the organic acid added.