Patent ID: 7270795

Claim:
A method for producing nano-carbon materials, characterized in that said method includes a step wherein (i) a starting material comprising one or more kinds of compounds selected from the group consisting of saturated hydrocarbons, unsaturated hydrocarbons, saturated cyclic hydrocarbons, and alcohols whose atomic ratio of the component carbon to the component oxygen is more than 2.0 and (ii) a catalyst comprising one or more kinds of materials selected from the group consisting of transition metal element-containing materials, alumina, silica, and silicon carbides are together treated at a temperature in a range of from 100 to 800° C. while being compressed at a pressure in a range of from 0.2 to 60 MPa, where said starting material is converted into a supercritical fluid or a subcritical fluid while said supercritical fluid or said subcritical fluid being contacted with said catalyst, thereby to obtain a reaction product containing nano-carbon materials.