A four step kinetic model was developed to describe theNO
x reduction process by potassium containing coal-pellets.The relevance
and significance of the different stepsconsidered in the model as well as the considerationsassumed to introduce the equations associated to this modelwere properly discussed. The simulation both of the NO
xreduction
and carbon conversion evolution showsgood agreement with the experimental data obtainedthroughout lifetime tests at 350
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C for samples with differentpotassium contents. The set of parameters predicted bythe kinetic model have physical significance
and are helpfulin explaining the different behavior exhibited by thesamples. Some of these parameters can be correlatedwith different features of the samples. The potassium loadinginfluences mainly on the kinetic rate constant governingthe NO
x chemisorption step, thus explaining the increase inselectivity with the catalyst content exhibited by thistype of samples.