Journal of the Korean Industrial and Engineering Chemistry, Vol.15, No.5, 518-522, August, 2004
소성온도에 따른 CuO-Fe2O3 흡수제의 반응특성 연구
A Study of Desulfurization Ability for CuO-Fe2O3 Sorbents with Various Calcination Temperatures
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초록
본 연구에서는 25 wt% SiO2를 지지체로 사용하고, 첨가제 Fe2O3의 함량을 7.5 wt%, 15 wt%, 22.5 wt%로 달리하여 흡수제를 제조하였으며, 흡수제의 소성 온도를 700 ℃, 900 ℃ 그리고 1100 ℃로 달리하여 소성 온도의 변화에 따른 흡수제의 탈황성능을 TGA로 조사하였다. TGA 실험에서 황화온도는 500 ℃로 하였으며, 재생온도는 700 ℃로 하였다. 소성온도가 700 ℃인 흡수제보다 소성온도 900 ℃인 흡수제가 전반적으로 높은 탈황성능을 보였다. 또한 XRD 분석결과 소성 온도 1100 ℃인 흡수제에는 CuFeO2라는 새로운 형태의 화합물이 생성되어, CuFeO2를 포함하고 있지 않은 흡수제보다 훨씬 적은 환원력에도 불구하고 흡수제 100 g 당 10 g 이상의 황을 제거할 수 있는 탈황성능을 보였다.
In this study we investigated desulfurization abilities using a TGA for CuO-Fe2O3 sorbents calcined at three different temperatures of 700 ℃, 900 ℃, and 1100 ℃. CuO was used as the main active material; Fe2O3 was used as a support material. The desulfurization reaction temperature was 500 ℃ and the regeneration reaction temperature was 700 ℃. From the TGA experiments, the desulfurization ability of sorbent was calculated in terms of sulfur loading defined as g of sulfur absorbed per 100 g of sorbent. The sulfur loading of the sorbents calcined at 900 ℃ were higher than those of the sorbents calcined at 700 ℃. From the XRD results we found that CFS sorbents calcined at 1100 ℃ formed the CuFeO2 compound. Due to the formation of CuFeO2 the CFS sorbent calcined at 1100 ℃ showed more than 10 g of sulfur loading per 100 g of sorbent despite of the lowered reduction potential than the other sorbent.
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