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Homogeneous oxidation reactions of gaseous elemental mercury were experimentally tested to study the behavior of mercury compounds that contribute to toxic emissions in combustion fl ue gas. Chemical equilibrium calculations and reaction kinetics analysis were also carried out to help explain the experimental results. In particular, the chemical forms of oxidized mercury and their reaction paths were verifi ed in detail. Among the experimental results, molecular chlorine was confi rmed to have a higher oxidizing ability toward elemental mercury than hydrogen chloride does. From the chemical equilibrium calculation, the fi nal product of mercury compounds oxidized by chlorine was confi rmed to be mercury chloride (HgCl 2 ). Numerical analyses of reaction kinetics were mostly consistent with the experimental results and the chemical equilibrium calculations. The ratio of mercury oxidization by chlorine increases with temperature from 473 K to 873 K, although it decreases at temperatures higher than 1000 K. Sensitivity analysis revealed the dominant reaction path of the mercury oxidation by chlorine. First, elemental mercury reacts with Cl radicals to form HgCl. Then, the HgCl reacts with Cl 2 to produce HgCl 2 .