Fischer-Tropsch synthesis: Development of kinetic expression for a sol-gel Fe-Ni/Al₂O₃ catalyst

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• 作者：Majid Sarkari^a ; Farhad Fazlollahi^a ; Hossein Atashi^a ; ^{h.ateshy@hamoon.usb.ac.ir} ; Ali Akbar Mirzaei^b ; Vahid Hosseinpour^c
• 关键词：Catalysis ; Fischer&ndash ; Tropsch synthesis ; Kinetics ; Sol/gel technique ; Levenberg&ndash ; Marquardt (LM) method
• 刊名：Fuel Processing Technology
• 出版年：2012
• 期刊代码：36_03783820
• 类别：ce
• 出版时间：May, 2012
• 卷：97
• 期：Complete
• 页码：130-139
• 文件大小：842 K

摘要

In this experimental study, a kinetic model has been developed for Fischer-Tropsch synthesis reactions by using sol-gel technique and Fe/Ni/Al₂O₃ as the catalyst (40%Fe/60%Ni/40 wt.%Al₂O₃) in a differential fixed-bed micro reactor assuming no internal or external diffusion. Operating conditions of the reactor were as follows: total pressure 1-12 atm ; Temperature 220-260 掳C; H₂/CO feed ratio 1.5-2; gas hourly space velocity 2100-7000 cm³(STP)/h/g_cat and conversions of 6-37%of hydrogen and 7-21%of carbon monoxide. Mass transfer limitations were investigated by changing synthesis gas velocity in reactors which differ in size. Based on the hypothesis that water inhibits the intrinsic Fischer-Tropsch (FT) reaction rate in the iron-FT synthesis, all rate expressions in this study were in inverse ratio to number of vacant sites and CO and water content. The obtained data in this study were checked using 鈥渃omplete form of Langmuir-Hinshelwood-Hougan-Watson (LHHW)鈥?which has been proposed by Van der Laan and Botes. The kinetic parameters were determined using Levenberg-Marquardt (LM) method. The activation energy and heat of adsorption of CO and water were 103.81, 鈭?#xA0;56.82 and 鈭?#xA0;25.62 kJ/mol, respectively.