A differential method which uses local heating rates to evaluate non-isothermal kinetic parameters

A differential method is proposed which uses local heating rates to evaluat e non-isothermal kinetic parameters. The method allows to study the influen ce of the deviation of the true heating rate with respect to the programmed one on the values of the kinetic parameters. For application, the kinetic parameters of the following solid-gas decomposition reaction were evaluated : [Ni(NH3)(6)]Br-2(s)-->[Ni(NH3)(2)]Br-2(s)+4NH(3(g)). The results obtained revealed significant differences between the values of the non-isothermal kinetic parameters obtained by using local heating rates and those obtained by using the programmed heating rate. It was also demonstrated that the ki netic equation which makes use of the local heating rates permits a better description of the experimental (alpha, t) data than the kinetic equation w hich uses the programmed constant heating rate.