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SiO<sub>2</sub> 원료물질에 따른 Fischer-Tropsch 합성반응용 Fe계 촉매의 성능변화
천동현(Chun, Dong Hyun),김학주(Kim, Hak-Joo),현순택(Hyun, Sun-Taek),이호태(Lee, Ho-Tae),양정일(Yang, Jung-Il),양정훈(Yang, Jung Hoon),정헌(Jung, Heon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Fe계 촉매는 FT(Fischer-Tropsch) 합성반응에 매우 유망한 촉매로 주목받고 있으며, 280?C 미만의 저온 FT 합성반응의 경우, 침전법이 Fe계 촉매의 가장 전형적인 제조방법으로 알려져 있다. Fe계 촉매에 첨가되는 조촉매로는 Cu, K, SiO₂ 등이 가장 대표적이며, 이 중에서 특히 구조 조촉매로 첨가되는 SiO₂는 Fe계 촉매의 기계적 강도를 향상시킬 뿐만 아니라, 촉매의 성능에도 크게 영향을 미치는 것으로 보고되고 있다. 본 연구에서는 침전법을 이용하여 저온 FT 합성반응용 Fe계 촉매를 제조하였고, 구조 조촉매로 첨가한 SiO₂의 원료물질에 따른 Fe계 촉매의 성능변화를 조사하였다. SiO₂의 원료물질로는 콜로이드 SiO₂와 분말 SiO₂를 이용하였으며, 분말 SiO₂를 이용한 촉매가 콜로이드 SiO₂를 이용한 촉매보다 다소 높은 CO 전환율 및 중질탄화수소 선택도를 나타내는 것을 확인하였다.
FT 합성반응용 철촉매에 미치는 촉매특성에 미치는SiO<sub>2</sub> 첨가효과
천동현(Chun, Dong-Hyun),김학주(Kim, Hak-Joo),현순택(Hyun, Sun-Taek),양정훈(Yang, Jung-Hoon),이호태(Lee, Ho-Tae),양정일(Yang, Jung-Il),정헌(Jung, Heon) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Precipitated iron-based catalysts are highly promising for the Fischer-Tropsch synthesis (FTS), in particular for the low temperature FTS below 280?C, because of their high activity and low cost. SiO₂ is an essential promoter for the precipitated iron-based catalysts to improve the attrition strength and physical stability. In this study, we carried out FTS over precipitated iron-based catalysts with and without SiO₂ in a fixed-bed reactor. The catalysts were prepared by a conventional co-precipitation method. In case of the catalysts with SiO₂, we used two comparative preparation methods, i.e., incorporation of SiO₂ before precipitation (denoted as precipitated SiO₂) and after precipitation (denoted as binder SiO₂), respectively. The addition of SiO₂ crucially affects both physico-chemical properties and catalytic peformance of precipitated iron-based catalysts.
철 촉매를 이용한 Fischer-Tropsch 합성 반응과 수성 가스 전환 반응에 대한 반응 속도 연구
양정일 ( Jung Ii Yang ),천동현 ( Dong Hyun Chun ),박지찬 ( Ji Chan Park ),정헌 ( Heon Jung ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
The kinetics of the Fischer-Tropsch synthesis and water gas shift reactions over a precipitated iron catalyst were studied in a 5 channel fixed-bed reactor. Experimental conditions were changed as follows: synthesis gas H2/CO feed ratios of 0.5~2, reactants flow rate of 60~80ml/min, and reaction temperature of 255~275˚C at a constant pressure of 1.5 MPa, The reaction rate of Fischer-Tropsch synthesis was calculated from Eley-Rideal mechanism in which the rate-determining step was the formation of the monomer species (methylene) by hydrogenation of associatively adsorbed CO. Whereas water gas shift reaction rate was determined by the formation of a formate intermediate species as the rate-determining step. As a result, the reaction rates of Fischer-Tropsch synthesis for the hydrocarbon formation and water gas shift for the CO2 production were in good agreement with the experimental values, respectively. Therefore, the reaction rates (r FT, r WGS, -r CO) derived from the reaction mechanisms showed good agreement both with experimental values and with some kinetic models from literature.