The kinetics studies of the carbon deposit formation in the process of decomposition of ethylene on nanocrystalline iron

摘要

This paper deals with kinetics studies of the carbon deposit containing carbon nanotubes on the triply promoted (K_2O, CaO, Al_2O_3) nanocrystalline iron. The synthesis were carried out under the flow of pure ethylene or ethylene - nitrogen mixture, under atmospheric pressure, at a constant temperature in the range of 440 - 520°C. The weight growth of the samples was controlled using thermobalance. The phase composition of obtained products was determined using X-ray diffraction method. The effect of ethylene partial pressure was investigated. Under the experiment conditions (P_(ethylene)>0.25bar), the rate of carbon deposit creation was independent of the ethylene partial pressure. The maximal carbon yield, which is possible to achieve at a given temperature, was also calculated.