Influence of chemically active additives on kinetics of acetylene self-decomposition and following soot formation

In this work, the kinetics of pyrolysis and subsequent soot yield in undiluted mixtures of acetylene with chemically active additives, namely acetone, hydrogen, oxygen, methane and propane-butane mixture, were investigated numerically over a wide range of pressures and temperatures using the modern kinetics mechanisms. It was shown that with different amounts of additives and under different temperature/pressure conditions, both acceleration and deceleration of acetylene pyrolysis was possible. The determining factors were either additional thermal effects or new reaction channels arising in the presence of certain additives. The greatest inhibitory effect was observed with the addition of alkanes, while the oxygen additives caused significant acceleration of pyrolysis due to exothermic oxidative reactions. The results of the calculations qualitatively agree with available experimental data in the literature obtained from different reactors.