| 초록 |
TiO2 has been a good catalyst and support in selective oxidation of hydrogen sulfide. Preparation of catalyst by sol-gel method improved the activity of catalyst comparing to other preparation method. In the present work, CeO2-TiO2 catalysts were synthesized by using sol-gel method, and their catalytic performance was studied for the selective oxidation of H2S to elemental sulfur. The obtained catalysts were characterized by XRD, BET surface area measurements, XPS, H2-TPR, and NH3-TPD. The reaction tests were carried out in a continuous flow fixed-bed reactor at temperature ranging from 220-300 ºC. The conversion of H2S increased with increasing temperature for CeO2-TiO2 catalysts, while the selectivity to SO2 remained almost constant. TiO2 species present in the catalyst plays the main role in the activity shown by the CeO2-TiO2 catalysts. CeO2-TiO2 (1:3) showed higher activity than that of TiO2, and the highest conversion of hydrogen sulfide among other catalysts. Conversion of H2S decreased with the increase of CeO2 content. The good catalytic performance may be due to the high surface area and the presence of acid sites. |
