TWO-LAYER CATALYST, PROCESS FOR PREPARING SAME AND USE FOR THE MANUFACTURE OF NANOTUBES

摘要

The invention relates to a catalyst material for preparing nanotubes, especially carbon nanotubes, said material being in the form of solid particles, said particles comprising a porous substrate supporting two superposed catalytic layers, a first layer, directly positioned on the substrate, comprising at least one transition metal from column VIB of the Periodic Table, preferably molybdenum, and a second catalytic layer, positioned on the first layer, comprising iron. The invention also relates to the process for preparing same and to a process for the synthesis of nanotubes using this catalyst material.