| 초록 |
We evaluated sulfur capacity of Red-mud with and without calcination step to investigate the potential of the desulfurization as sulfur absorbent from the COS(g) by both experimentally and computationally. We found that over 350℃, powder type for Red-mud has a higher sulfur capacity than pellet type. In addition, the calcinated powder type has shown the greater performance as sulfur absorbent than non-calcined Red-mud. Through XRD analysis, we confirmed that the structures are not significantly different between non-calcined and calcined red-mud, and Fe2O3 is found to be the major component of Red-mud. Based on the results, we suspected that the factors of affecting absorbed capacity is crystallinity and porosity changes by the calcination. We also performed DFT calculation to obtain fundamental insights for sulfur absorption mechanism of COS(g) on Fe2O3(001). The computation results showed that the reaction readily occur with low energy barriers for bond cleavage from COS to CO+S as the presence of an oxygen vacancy. In the rest of talk, we will provide more details of the crystallinity, porosity, detailed components of Red-mud by using scanning EA, BET, XRF, respectively. |
