Patent ID: 8398894

Claim:
A process for preparing a catalyst having 0.3˜0.8 g/mL apparent density for preparing carbon nanotubes by controlling the amount of a co-precipitating agent showing inverse-correlation with the apparent density of the catalyst, the process comprising: i) preparing a slurry by precipitating a metal element of the catalyst using the co-precipitating agent; ii) filtering, drying, milling and thermally treating the obtained slurry; and iii) obtaining the catalyst for preparing carbon nanotubes, wherein the apparent density of the catalyst is controlled by adding 3˜8 equivalents of the co-precipitating agent when a total mole amount of the metal element of the catalyst is converted into 1 equivalent, and wherein the amount of the co-precipitating agent shows inverse-correlation with the apparent density of the catalyst.