화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.18, No.4, 1223-1232, July, 2012
DOI10.1016/j.jiec.2011.10.011  Export Citation
Development of a kinetic model for Fischer.Tropsch synthesis over Co/Ni/Al2O3 catalyst
Farhad Fazlollahi, Majid Sarkari, Akbar Zare1, Ali Akbar Mirzaei1, and Hossein Atashi†
  • Department of Chemical Engineering, Faculty of Engineering, University of Sistan & Baluchestan, P.O. Box 98164-161, Zahedan, Iran
  • 1Department of Chemistry, Faculty of Science, University of Sistan & Baluchestan, P.O. Box 98135-674, Zahedan, Iran
E-mail:
In the present research an active Co-Ni/Al2O3 catalyst was prepared by impregnation method for synthesis of light olefins in Fischer-Tropsch synthesis. After studying the effects of using optimized operating conditions on catalyst performance, the kinetic experimental study was performed in a differential micro-fixed-bed-reactor by altering reaction temperature (230-270 ℃), pressure (2-12 bar), gas hourly space velocity (2000-7200 h^(-1)) and H2/CO feed molar ratio (1-3). Based on Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach, seven different two-parameter kinetic models were considered. The kinetic data of this study were fitted accurately by a simple form -rCO = APCOPH2 /(1 + bPCOP0.5H2)2 that assumed the following kinetically relevant steps, where CO dissociates via interaction with adsorbed hydrogen; the first hydrogenation step of the surface carbon was reversible and fast, while the second one was slow and rate determining. The kinetic parameters were determined using Levenberg-Marquardt (LM) method and the apparent activation energy and heat of adsorption were 78.70 kJ/mol and -14.16 kJ/mol, respectively.
Keywords:Fischer-Tropsch synthesis;Co-Ni catalyst;Kinetics;Chemical reactors;Levenberg-Marquardt (LM) method
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