Global kinetic analysis of complex materials

A variety of global kinetic models are reviewed, including first-order, nth -order, nucleation, and sequential models as well as models having Gaussian , Weibull, and discrete activation-energy distributions. The important char acteristics of these various models are outlined, with guidance in how to s elect the correct model. Some of the models have similar characteristics, a nd the parameter relationships among similar models are discussed. The comp arison includes the relationship between conversion-dependent parameters de termined by modified Friedman and Coats-Redfern isoconversion methods and r eactivity distribution parameters determined by nonlinear regression of rat e or fraction-reacted profiles. A new method for deriving discrete activati on-energy distribution parameters having In(A) = a + bE is also presented. Data accuracy requirements are discussed briefly. Kinetic analyses are give n for a variety of materials, including synthetic polymers (polyethylene, p olystyrene, polydimethylenenaphthalene, polysulfone, and polyvinyl acetate) , petroleum sources rocks (including well-preserved algal kerogens and the Bakken and Monterey shales), oil shales (including kukersite), and the Illi nois and Pittsburgh Premium coal samples.