| 초록 |
Purification of natural gas and hydrotreatment of crude oil fractions and the steel smelting process in various industries have produced large amounts of highly poisonous hydrogen sulfide (H2S). For many years, most of H2S in refineries and smelt plants have been removed by converting it into elemental sulfur by Claus process. However, the remaining 3-5 % H2S arise SOX emission problem during the incineration. One approach is the selective catalytic oxidation of H2S to ammonium thiosulfate (ATS) and elemental sulfur, which we have been reported in our previous works. Here, we synthesized the Nb2O5/Fe-PILC catalysts and studied the catalytic activity for the selective oxidation of H2S. The synthesized catalysts were characterized by XRD, BET, Raman, NH3-TPD, H2-TPR and XPS. It showed over 90% conversion of hydrogen sulfide to elemental sulfur. 2 wt. % Nb2O5/Fe-PILC showed the highest H2S conversion among the Nb2O5/Fe-PILC catalysts tested in this work. For the more effective understanding of reaction mechanism, the distribution of solid production of solid products (S and ATS) was also discussed. |
