KINETIC MODELING OF SOLID CARBON PARTICLE FORMATION AND THERMAL DECOMPOSITION DURING CARBON SUBOXIDE PYROLYSIS BEHIND SHOCK WAVES

摘要

The kinetic modeling of carbon suboxide (C_3O_2) thermal decomposition and formation, transformation, and thermal decomposition of solid fullerene-like and soot-like carbon particles is carried out by one-step heating for the mixture of 0.33% C_3O_2 in Ar within the temperature range of 1200 to 2250 K at the pressure of 5 MPa and for a two-step heating for the mixtures of 1%, 2%, and 4% C_3O_2 in Ar within the temperature range of 2400 to 3750 K at 2 MPa. The formation of small carbon clusters up to C_(30) in the gas phase and the formation, growth, transformation, coagulation, and thermal decomposition of the precursors, fullerene-like and solid-like solid carbon particles, are modeled with the help of a detailed gas-phase kinetic scheme combined with the kinetic scheme for heterogeneous reactions in the context of the discrete Galerkin method. The experimentally measured and calculated values of the induction period τ of solid carbon particle formation, the total yield of solid carbon particles Y, and the observable growth rate constant of solid carbon particles k_f are compared and demonstrate a good agreement. The possible pathways of transformation of the precursors, fullerene-like and soot-like solid carbon particles, are analyzed.