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首页> 外文期刊>Journal of industrial and engineering chemistry >Development of a kinetic model for Fischer-Tropsch synthesis over Co/Ni/Al2O3 catalyst
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Development of a kinetic model for Fischer-Tropsch synthesis over Co/Ni/Al2O3 catalyst

机译：Co / Ni / Al2O3催化剂上费-托合成动力学模型的建立

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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 °C), 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 -r_(CO) = AP_(co)P_(h2)/(1 + BP_(CO)P_(h2)~(0.5))~2 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.
机译：在本研究中，通过浸渍法制备了费-托合成轻烯烃的活性Co-Ni / Al2O3催化剂。在研究了使用最佳操作条件对催化剂性能的影响之后，通过改变反应温度（230-270°C），压力（2-12 bar），气体在微分固定床反应器中进行了动力学实验研究。时空速（2000-7200 h〜（-1））和H2 / CO进料摩尔比（1-3）。基于Langmuir-Hinshelwood-Hougen-Watson（LHHW）方法，考虑了七个不同的两参数动力学模型。通过简单假设-r_（CO）= AP_（co）P_（h2）/（1 + BP_（CO）P_（h2）〜（0.5））〜2的简单形式准确拟合本研究的动力学数据相关步骤，其中CO通过与吸附的氢相互作用而解离;表面碳的第一个氢化步骤是可逆且快速的，而第二个氢化步骤则是缓慢且决定速率的。使用Levenberg-Marquardt（LM）方法测定动力学参数，表观活化能和吸附热分别为78.70 kJ / mol和-14.16 kJ / mol。

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