Temperature Effect on Removal of Sulfur Dioxide and Benzene in Humid Air by DC Corona Discharge

A DC corona discharge reactor was applied to remove sulfur dioxide (SO<INF>2</INF>) and benzene (C<INF>6</INF>H<INF>6</INF>) from N<INF>2</INF>-O<INF>2</INF>-H<INF>2</INF>O mixed gas in the temperature range from room temperature to 400 °C. When SO<INF>2</INF> was removed, the temperature elevation caused the decrease of the removal efficiency of SO<INF>2</INF>. On the other hand, the removal efficiency of C<INF>6</INF>H<INF>6</INF> was not significantly influenced by the temperature elevation. In the simultaneous removal of SO<INF>2</INF> and C<INF>6</INF>H<INF>6</INF> in the relatively low temperature range below 200 °C, the removal efficiency of SO<INF>2</INF> is significantly inhibited by coexisting C<INF>6</INF>H<INF>6</INF>. When the simultaneous removal was conducted in the high temperature range, the removal efficiency of SO<INF>2</INF> was not sensitive against the coexisting C<INF>6</INF>H<INF>6</INF>. On the other hand, the removal efficiency of C<INF>6</INF>H<INF>6</INF> was almost independent of coexisting SO<INF>2</INF> at all temperatures. A hypothesis of reaction mechanism was discussed based on radical reactions with SO<INF>2</INF> and C<INF>6</INF>H<INF>6</INF> to explain the trend observed in the experiment.