Kinetics of the transition of titanium dioxide prepared by sulfate process and chloride process.

Abstract

Abstract The kinetics of the phase transformation of anatase to rutile was studied by means of X-ray diffraction. Samples of anatase were prepared by sulfate and chloride processes. The kinetic data could well be expressed by the equation α=1−e−btn, where α is the fraction of anatase transformed in time t, and b and n constants. The activation energy of the phase transformation is 105 kcal/mol for the sample prepared by the sulfate process, and 107 kcal/mol for the sample prepared by the chloride process. These values of activation energy are compared with those previously obtained.