STUDY OF PHYSICO-CHEMICAL PROCESSES ON CATALYST IN THE COURSE OF SYNTHESIS OF CARBON NANOMATERIALS

摘要

The catalysts based on metals of iron group (Fe, Ni, Co) and their alloys are used at the different methods of production of carbon nanomaterials. The selection of optimal regimes of these materials production calls for the fundamental consideration of processes on the catalyst. An investigation of distribution and thermally activated redistribution of interstitial carbon atoms about the volume and surface of crystalline films has been carried out. These crystals have bcc lattice and various types of free facets. The kinetic curves of interstitial atoms redistribution under changes of temperature have been studied. The correlation has been made between theoretical calculations and experimental data for the graphitization of Fe-C, Ni-C, Co-C alloys and Fe-C alloy with V, Cu, Ti, Co or Ni impurity. The energetic conditions and possibility of macroscopical surface segregation of interstitial atoms have been established.