PURPOSE: To prepare a catalyst carrier having a large specific surface area, by treating graphite particles or particles obtained by the graphitization of carbon black in plasma of inert gas or oxygen-containing inert gas.

CONSTITUTION: Graphite particles or particles obtained by the graphitization of carbon black are treated in plasma of inert gas comprising either one of nitrogen and argon or oxygen-containing inert gas. By this method, a catalyst carrier having a large specific surface area can be prepared and a catalyst having corrosion resistance and high catalytic activity is obtained by using said carrier.