CNT and method for manufacturing thereof

摘要

Disclosed are carbon nanotubes and a method for manufacturing the same wherein the carbon nanotubes (CNTs) which comprise a three-component carbon nanotube catalyst containing a catalytic component and an active component and have a potato or spherical shape with a particle diameter distribution (Dcnt) of 0.5 to 1.0 can be manufactured at a high yield using an impregnated supported catalyst by simultaneously removing activity and a fine powder of the impregnated supported catalyst in an attempt to solve a drawback of conventional impregnation methods for producing CNTs, namely, the difficulty in improving a yield of CNTs.

主权项

1. Particles comprising:
an alumina support; a three-component catalyst that comprises a catalytic component, a multicarboxylic acid and an active component coated on a surface of the alumina support; and carbon nanotubes on a surface of the three-component catalyst, wherein the catalytic component comprises a first catalytic component and a second catalytic component, wherein a number of moles (x) of the first catalytic component, a number of moles (y) of the second catalytic component and a number of moles (z) of the active component satisfy ranges of 30≦x+y≦53, 0.1≦y/[x+y]≦0.95 and 3≦z≦13, based on 100 moles of the alumina support, wherein the each of the particles has a spherical shape having a particle diameter distribution (Dcnt) of 0.5 to 1.0, wherein the particle diameter distribution (Dcnt) is defined by Equation 1:
Dcnt=[Dn90−Dn10]/Dn50  [Equation 1] wherein Dn90 is a number average particle diameter which is measured based on 90% in an absorption mode using Microtrac particle diameter analyzer after the particles are immersed in distilled water and then allowed to stand for 3 hours, Dn10 is a number average particle diameter measured based on 10% under the same condition as Dn90, and Dn50 is a number average particle diameter measured based on 50% under the same condition as Dn90, and wherein a molar ratio of the multicarboxylic acid to the active component is in a range of 0.34616 to 0.36665.