Development of a kinetic model for Fischer-Tropsch synthesis over Co/Ni/Al2O3 catalyst

作者：Fazlollahi Farhad; Sarkari Majid; Zare Akbar; Mirzaei Ali Akbar; Atashi Hossein^*

来源：Journal of Industrial and Engineering Chemistry, 2012, 18(4): 1223-1232.

DOI：10.1016/j.jiec.2011.10.011

• Fischer-Tropsch synthesis
• Co-Ni catalyst
• Kinetics
• Chemical reactors
• Levenberg-Marquardt (LM) method

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 degrees C), pressure (2-12 bar), gas hourly space velocity (2000-7200 h(-1)) and H-2/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 -r(CO) = AP(CO)P(H2)/(1 + bP(CO)P(H2)(0.5))(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.

• 出版日期2012-7-25