Photochemical Removal of SO2 and CO2 by 172 nm Xe2 and 146 nm Kr2 Excimer Lamps in N2 or Air at Atmospheric Pressure

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The photochemical removal of SO2 and CO2 was investigated in N2 or air using 172 nm Xe2 (50 or 300 mW/cm2) and 146 nm Kr2 (25 mW/cm2) excimer lamps and without using any expensive catalysts. After 30 min photoirradiation, 45 and 75% of SO2 (1000 ppm) were removed in N2 and air (20% O2) at 172 nm photoirradiation, respectively, whereas 39 and 8% of SO2 were removed in N2 and air at 146 nm, respectively. By using a high-power Xe2 lamp, ${\sim}10$ and ${\sim}45$% of SO2 (200 ppm) could be removed in N2 and air in a flow system, respectively. Although no photolysis of CO2 (1000 ppm) was observed at 172 nm, ${\sim}16$ and ${\sim}8$% of CO2 were converted to $\text{CO}+\text{O$_{2}$}$ in N2 and air at 146 nm after about 10 min photoirradiation, respectively. Possible decomposition mechanisms were discussed.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-12-25