The Pulsed Homogeneous Laser Pyrolysis: Determination of Arrhenius Parameters of CHClF₂ Destruction Basing on the Model of Physical and Chemical Processes

Abstract

The Pulsed Homogeneous Laser Pyrolysis (PHLP) of CHClF₂ initiated by IOP(20) radiation of TEA-CO₂ laser was carried out in the presence of SF₆ sensitizer with the mixture components ratio 1:1 under partial pressure of the reactant equal to 1 Torr and 2 Torr.To describe PHLP process in the afterpulse period we suggested a kinetic model of CHClF₂ thermal destruction accounting for the inhomogeneity of laser heating of the reaction mixture and its further cooling by the heat conduction mechanism. Applying the standard mathematical procedure for matching the experimental results of the degree of reactant destruction, and the numeric computations of this value made according to the suggested model, the Arrhenius parameters of the reaction of CHClF₂ monomolecular conversion in the temperature range of 1000–1200 K were unambiguously determined. The values were obtained for the activation energy Eα = 52.8 ± 0.3 kcal/mol, and the pre-exponential factor A = (2.5 ± 1) · 10¹² s⁻¹.