Kinetics of γ-alumina chlorination by phosgene

Abstract

The kinetics of the reaction between γ-Al2O3 and COCl2 have been studied by isothermal TG measurements in the temperature range 585-1085 K. The influence of the partial pressure of COCl2 on the reaction rate was investigated at 648, 673 and 698 K in the 104-105 Pa range, using N2 as a diluting gas. The reaction seems to proceed in the chemical control region below 675 K. Above this temperature, however, diffusional processes and decomposition of COCl2 are considered to affect the reaction rate. In the chemical control region an apparent order of reaction of 0.75 in respect of COCl2 and an apparent activation energy of 128-135 kJ mole-1 were found for the chlorination process. © 1981.