| Abstract
| - TiO2 is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH3. Furthermore,it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorptionof SO2 and NO over two kinds of TiO2 catalysts was investigated using a conventional flow type fixed-bedreactor at 100 °C under atmospheric pressure. The effect of the presence of SO2 on the adsorption of NOover the catalysts and the formation NO2 from NO was studied. The relationship between the NO2 formation,the NO adsorption, and the SO2 adsorption was also studied. The presence of SO2 was essential for theoxidative adsorption of NO over the catalysts. SO2 was adsorbed and converted to SO42-, then NO adsorbedon the SO2 pre-adsorbed catalyst and converted to NO3-. The presence of both SO2 and NO contributed tothe formation NO2 from NO over the TiO2 samples. It was found that NO2 was evolved from an equimolarreaction of NO and SO2.
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