| 초록 |
Hydrogen sulfide (H2S), which is highly odorous and toxic, accompanies fuels in oil and gas refinery processes. Since, increasing environmental concerns have been issued, reducing H2S along with SO2 became one of the leading issues in emission reduction. TiO2 has been considered as a good catalyst and support in selective oxidation of hydrogen sulfide. On the other hand, CeO2 has good redox property and high mobility of capping oxygen. Sol-gel method for preparation of the catalyst improved the catalytic activity compare to other methods. In the present work, CeO2-TiO2 catalysts were synthesized by using sol-gel method, and their catalytic performance has been investigated for the selective oxidation of H2S to elemental sulfur. The obtained catalysts were characterized by XRD, BET, and XPS. CeO2-TiO2 catalysts with the higher proportion of TiO2 show very good conversion of H2S without any considerable emission of SO2. Conversion of hydrogen sulfide decreased with the increase of CeO2 content. Catalysts with more Ce3+/Ce4+ showed higher reactivity, since Ce3+ can increase the vacancies and the unsaturated chemical bonds on the surface. |
