| Flue gas desulfurization is widely used and very effective for controlling SO, emission. Dry desulfurization processes, overcoming disadvantages existing in wet processes, offer a great potential for SO, control. Generally, dry processes can be characterized into two groups. One is based on desulfurizers containing basic metal oxides (such as CaO, Fe,O3 and CuO), these desulfurizers are active only at temperatures greater than 350℃ and are difficult to be regenerated. Another one is based on activated carbon materials, which have abundant micro pores and high specific surface area, but show high sulfur capacity only at normal temperatures. However, the preferable and the most economical temperature for SO, removal is 120-250℃, which is the flue gas temperature at the inlet of the stack. Therefore, it is needed to develop desulfurizers of high activity at temperatures of 120-250 ℃ and regenerable under mild conditions. Use of such desulfurizers can avoid preheating or precooling of flue gases and result in easy access to existing burner systems.Fe/AC desulfurizer shows high activity in 120-250℃. After sorbed SO2, H2SO4 and Fe2(SO4)3 are generated. Calcination temperation and Fe loadings play important roles in SO2 removal. The Fe/AC desulfurizar calcinated at 250℃ shows the highest activity. The preferable Fe loadings for the Fe/AC are in the range of 3.5-14%. The used Fe/AC can be regenetated by NH3 at about 350 ℃. BET surface area, TG,XRD,EXAFS are used to charactered the results. flue gas desulfurization; activated coke supported catalyst; regeneration... |
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