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The influence of CF 3 I on the burning velocity of methane–air flame is experimentally and numerically studied. Experimental results demonstrate that the inhibition effectiveness of CF 3 I is very close to that of CF 3 Br. A detailed kinetic model of flame inhibition by CF 3 I is presented, based on an updated version of a previous model. The kinetic model contains 1072 reactions with 115 species including 10 iodine-containing species. Modeling results demonstrate good agreement with experimental data, and both experiments and calculations show that CF 3 I is only slightly less effective at reducing the burning velocity than CF 3 Br. The flame structure predicted from numerical simulations is analyzed and shows that main reactions of the inhibition cycle of CF 3 I are as follows: H+ HI = H 2  + I; H + I + M = HI+M; I + I + M = I 2  + M; H+ I 2  = HI+I; I+ CH 3  + M = CH 3 I+M; H+ CH 3 I = CH 3 + HI; I+ HCO = HI+CO; HI+OH = H 2 O+I and O+ HI = I+ OH.

A Kinetic Mechanism for CF 3 I Inhibition of Methane–Air Flames