A description of thermal decomposition kinetics of dehydration of zinc oxalate dihydrate

A new method of the multiple rates-isotemperature is proposed to define the most possible mechanism g( alpha) of thermal decomposition; the iterative isoconversional procedure has been employed to estimate apparent activation energy E-a; the pre-exponential factor A is obtained on the basis of E-a and g( alpha). By this new. method, the thermal analysis kinetic triplet of dehydration of zinc oxalate dihydrate is determined, where apparent, activation energy E-a is 87. 22 kJ . mol (-1); pre-exponential factor A is 4. 2120 x 10(8)similar to7.2328 x 10(8) s (-1) and the: most probable mechanism belongs to random nucleation and growth A(m)(Avrami-Erofeer equation), with integral. form g(alpha) in(1 - alpha) and differential form f(alpha) m(1 - alpha) [-ln(1 - alpha) accomodation factor m 1.85similar to2.00.