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Received December 14, 2009
Accepted January 13, 2010
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Fischer-Tropsch 합성반응용 Fe계 촉매의 성능 및 물리화학적 특성에 미치는 SiO2 첨가효과
Effects of SiO2 Incorporation on Catalytic Performance and Physico-Chemical Properties of Iron-Based Catalysts for the Fischer-Tropsch Synthesis
Sun-Taek Hyun1 2
Dong Hyun Chun2
Hak-Joo Kim2
Jung Hoon Yang2
Jung-Il Yang2
Ho-Tae Lee2
Kwan-Young Lee1†
Heon Jung2†
1고려대학교 화공생명공학과, 136-791 서울시 성북구 안암동 5-1 2한국에너지기술연구원 청정화석연료연구센터, 305-343 대전시 유성구 장동 71-2
1Department of Chemical and Biological Engineering, Korea University, 5-1 Anam-dong, Seongbuk-gu, Seoul 136-701, Korea 2Clean Fossil Energy Research Center, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
Korean Chemical Engineering Research, June 2010, 48(3), 304-310(7), NONE Epub 5 July 2010
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Abstract
공침법을 이용하여 구조 조촉매인 SiO2가 첨가된 Fe계 촉매와 SiO2가 첨가되지 않은 Fe계 촉매를 제조하였고, 이러한 두 가지 촉매를 이용하여 250 ℃의 온도 및 1.5MPa의 압력에서 Fischer-Tropsch 합성반응을 수행하였다. SiO2를 첨가한 Fe계 촉매가 SiO2를 첨가하지 않은 Fe계 촉매보다 현저히 우수한 촉매활성을 나타내었고, 144시간의 반응시간 동안 뛰어난 촉매안정성을 나타내었다. X-선 회절 및 N2의 물리흡착을 통하여 촉매의 결정구조 및 세공구조를 분석한 결과, SiO2를 첨가할 경우 Fe계 촉매의 분산도가 향상되는 것을 발견할 수 있었다. 또한 H2-TPR(temperature-programmed reduction) 분석결과를 통해, SiO2를 첨가할 경우 260 ℃ 이하의 저온 영역에서 Fe2O3의 Fe3O4 및 FeO로의 환원이 촉_x000D_
진되는 것을 확인하였다. 반면 CO2-TPD(temperature-programmed desorption) 분석결과에 의하면, SiO2를 첨가한 결과 촉매의 표면 염기도는 감소하였다. 따라서 SiO2를 첨가한 촉매가 SiO2를 첨가하지 않은 촉매보다 우수한 촉매성능을 나타내는 것은, SiO2를 첨가함에 따라 촉매의 분산이 증진되고 환원이 촉진된 것이 주요 원인인 것으로 생각된다.
The FTS(Fischer-Tropsch synthesis) was carried out over precipitated iron-based catalysts with or without SiO2 in a fixed-bed reactor at 250 ℃ and 1.5 MPa. The catalysts with SiO2 showed much higher catalytic activity for the FTS than those without SiO2, displaying excellent stability during 144 h of reaction. The X-ray diffraction and N2 physisorption revealed that the catalysts with SiO2 showed enhanced dispersion of Fe2O3 compared with those without SiO2. Also, the results of temperature-programmed reduction by H2 showed that the addition of SiO2 markedly_x000D_
promoted the reduction of Fe2O3 into Fe3O4 and FeO at low temperatures below 260 ℃. In contrast, surface basicity of the catalysts, which was analyzed by temperature-programmed desorption of CO2, decreased as a result of SiO2 addition. We attribute the high and stable performance of the catalysts with SiO2 to the improved dispersion and reducibility by the SiO2 addition.
Keywords
References
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ASTM D2887-08, “Standard Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography,” ASTM International, PA (1989)
Pham HN, Datye AK, Catal. Today, 58(4), 233 (2000)
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Stenger Jr. HG, J. Catal., 92, 426 (1985)
