A NEW METHOD FOR THE PRODUCTION OF NANOCARBON AND HYDROGEN FROM THE PROPANE-BUTANE FRACTION

The kinetic regularities of the process of nanocarbon and hydrogen production from propanebutane fraction under differential reactor conditions have been studied in this work. The initial time period (≈10 min) is the stage of reduction of Ni, Co, Fe and Mo oxides to metal, accumulation of free carbon and formation of carbon nanotube particles. The influence of temperature on the specific yield was studied in the temperature range 550÷700 °C with a step of 10 °C. The thickness of the catalyst layer hk ≈ 0.2 mm (m = 12 mg), carbon accumulating gas flow rate 9±0.1 l/h, process time 12 min. Starting from 620 °C, the process temperature does not affect the specific yield of carbon nanostructures, which is η ≈ 22 gcarbon/gkat. In the process, the specific yield of carbon nanostructures was determined by the formula η = (mproduct – mkat)/mkat. Experimental studies to determine the dependence of the specific yield of carbon nanostructures on the process time were carried out at temperatures from 550 to 700 °C and hydrocarbon flow rates from 15 to 20 l/h. The initial high-silica zeolite and modified samples were investigated by IR spectroscopy, X-ray phase analysis, methods of benzene adsorption before their treatment and subsequent structural characterisation, acid properties of catalysts, temperature-programmed desorption of ammonia. Investigations of the possibility of synthesis of carbon nanostructures by catalytic pyrolysis of propane-butane mixture (С3Н8/С4Н10 = 50/50% and С3Н8/С4Н10 = 30%/70%) on a catalyst of the type (15%Ni - 5%Co - 5%Fe - 5%Cu - 2%Mo/HSZ) allow us to conclude that the parameters of the regimes and the obtained ratios are the basis of recommendations for the design of laboratory reactors with a fixed catalyst bed.