Peculiarities of Obtaining a Catalyst for the Synthesis of Nanostructured Carbon Materials via Thermal Decomposition

The paper presents the peculiarities of catalysts preparation through thermal decomposition and calcination. We propose methods for the evaluation of reagents solubility and decomposition degree that allow eliminating and adapting (NH4)(6)Mo7O24 center dot 4H(2)O, which does not meet the reagent solubility requirements contain (NH4)(2)MoO4, to obtain catalyst used to synthesize carbon nanotubes (CNTs) with a diameter of 5-30 nm via chemical vapor deposition. The density (1510. . . 1515 kg/m(3)) and electrical conductivity (1.54. . . . 1.72 mu S/cm) experimentally found for the initial solution make it possible to control the pre-catalyst quality prior to the thermal decomposition stage. With the help of obtained Co-Mo/Al2O3-MgO catalyst CNTs yield was achieved as 10.3. . . 11.9 and 20.3. . .23.0 [gram of CNTs / gram of catalysts] when using ethylene and propane-butane mixture as a carbon-containing gas, respectively.