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

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• 作者：Farhad Fazlollahi^a ; Majid Sarkari^a ; Akbar Zare^b ; Ali Akbar Mirzaei^b ; Hossein Atashi^a ; ^{h.ateshy@hamoon.usb.ac.ir}
• 关键词：Fischer&ndash ; Tropsch synthesis ; Co&ndash ; Ni catalyst ; Kinetics ; Chemical reactors ; Levenberg&ndash ; Marquardt (LM) method
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2012
• 期刊代码：P29_1226086x
• 类别：ce
• 出版时间：25 July, 2012
• 卷：18
• 期：4
• 页码：1223-1232
• 文件大小：1130 K

摘要

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 掳C), pressure (2-12 bar), gas hourly space velocity (2000-7200 h^鈭?) 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 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 鈭?4.16 kJ/mol, respectively.