MEASUREMENT OF THE KINETICS OF THE HIGH TEMPERATURE OXIDATION OF TiCl_4

摘要

We measure the kinetics of TiCl_4 kinetics at high temperatures using a batch reactor consisting of a gas mixture (typically 0.3% TiCl_4 in Ar) confined by a piston in a cylinder. The gas in the reactor is compressed at different conditions to achieve peak temperatures ranging between 800 K to 1450 K with reaction times of 20-150 ms. We analyze the gas mixture before and after compression using Fourier transform infrared (FTIR) spectroscopy to determine the fractional conversion of the TiCl_4 reagent. Assuming first order pyrolysis kinetics, a model for interpreting the fractional conversion of TiCl_4 is developed. Regressing the data to the model yields an activation energy of 13.8 kcal/mole K and A = 9324 s~(-1). The model does not explain the variations in the data satisfactorily (R~2 = 0.47), and we conclude that TiCl_4 pyrolysis is not first order as commonly believed (1-3).