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Claus process, consisting of a furnace and catalytic reactors, is used to recover sulfur from H2S found in raw natural gas and gases from refineries. This acid gas is accompanied by contaminants such as benzene, toluene, xylenes (collectively called BTX), other hydrocarbons, NH3, CO2, N2 and sulfur compounds having detrimental effect on catalytic reactors, where BTX form soot particles and sulfur-hydrocarbons, and clog and deactivate the catalysts. This work focuses on BTX oxidation by SO2 as a potential solution that can be carried out in a BTX destruction unit placed between Claus furnace and catalytic units. Density functional theory is used to study the interaction between BTX-radicals and SO2 and the stability of the intermediate species formed during the course of the mechanism. The rates of elementary reactions are evaluated using transition state theory. The pathways leading to the formation of important by-products such as CO, SO, S, CHO were obtained.