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The evolution of rice straw char reactivity during reaction with NO was examined in differentialreactor at 900 and 1000 ℃.Original and acid-washed rice straw chars were used.Surface area andmineral content of char samples with different conversion were analyzed.The reactivity of theacid-washed char increased until conversion Xchar=20%,remained constant,and then decreasedcontinuously to zero.The reactivity of the original char decreased continuously to zero throughoutthe reaction,with a faster decrease at 1000 ℃.Mineral transformation during original char reactionwas obvious.Concentration of acid-soluble K decreased about 56%and 90%at 900 and 1000 ℃.Caand Mg released little to gas phase,but reacted with SiO2 in a small amount.The evolution of theacid-washed char reactivity correlated well with the development of surface area and was wellpredicted by random pore model.The reactivity of the original char depended not only on thedevelopment of surface area,but also on transformation of inherent minerals,mainly K.Atwo-reaction model was built which well predicted inherent K transformation.A modified randompore model was developed,which successfully simulated inherent mineral catalyzed char-NOreaction.