Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Effect of Reaction Conditions for n-Butane Dehydrogenation over Pt-Sn/θ-Al2O3 Catalyst

Pt-Sn/θ-Al2O3 촉매상에서 반응조건에 따른 n-부탄의 탈수소화 반응

  • Cho, Kyung-Ho (Green Chemistry Division, Korea Research Institute of Chemical Technology) ;
  • Kang, Seong-Eun (Department of Chemical Engineering, Chungbuk National University) ;
  • Park, Jung-Hyun (Department of Chemical Engineering, Chungbuk National University) ;
  • Cho, Jun-Hee (Department of Chemical Engineering, Chungbuk National University) ;
  • Shin, Chae-Ho (Department of Chemical Engineering, Chungbuk National University)
  • 조경호 (한국화학연구원 녹색화학연구단) ;
  • 강성은 (충북대학교 화학공학과) ;
  • 박정현 (충북대학교 화학공학과) ;
  • 조준희 (충북대학교 화학공학과) ;
  • 신채호 (충북대학교 화학공학과)
  • Received : 2012.06.08
  • Accepted : 2012.06.24
  • Published : 2012.06.30
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Abstract

Pt-Sn/${\theta}-Al_2O_3$ catalyst for n-butane dehydrogenation reaction was prepared by incipient wetness method. To confirm the physicochemical properties of Pt-Sn/${\theta}-Al_2O_3$ catalyst, the characterization was performed using X-ray diffraction (XRD), $N_2$ sorption analysis, temperature programmed desorption of $NH_3$ ($NH_3$-TPD), temperature programmed reduction of $H_2$ ($H_2$-TPR) techniques. Also, the catalytic activities of Pt-Sn/${\theta}-Al_2O_3$ for n-butane dehydrogenation was tested as a function of pretreatment temperature, pretreatment time, reaction temperature, and the partial pressure of n-butane and hydrogen. The sum of selectivities to n-butenes consisting of 1-butene, cis-2-butene, and trans-2-butene was almost constant 95% in the range of conversion of n-butane 5-55%. The activation energy calculated from Arrhenius equation was $82.4kJ\;mol^{-1}$ and the reaction orders of n-butane and hydrogen from Power's law were 0.70 and -0.20, respectively.

n-부탄의 탈수소화 촉매로 Pt와 Sn을 알루미나 지지체에 담지하기 위하여 함침법을 이용하여 Pt-Sn/${\theta}-Al_2O_3$ 촉매를 제조하였다. 물리적화학적 특성을 알아보기 위해 XRD, $N_2$ 흡탈착, $NH_3$-TPD, $H_2$-TPR 분석을 실시하였다. 또한 Pt-Sn/${\theta}-Al_2O_3$ 촉매상에서 탈수소반응에 대한 활성에 대한 영향을 관찰하기 위해서 전처리 온도, 전처리 시간, 반응온도, 공간속도에 따른 촉매의 활성에 대한 영향과 더불어 탈수소 반응에 대한 온도 조건에 따른 반응속도의 변화를 관찰하였다. 5~55% 부탄의 전환율 변화에 따른 부텐의 선택도 합은 95% 정도로 일정하게 유지되었다. 아레니우스식을 이용하여 얻은 활성화 에너지 $82.4kJ\;mol^{-1}$이었고, 멱함수를 이용하여 얻은 n-부탄 및 수소의 반응차수는 각각 0.70과 -0.20차로 나타났다.

Keywords

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