(583ds) Fischer–Tropsch Synthesis: Development of Kinetic Expression for An Impregnated Fe–Mn/Al2O3 Catalyst
In the last few years, the world energy crisis, cause to renewed interest in the Fischer–Tropsch synthesis (FTS) reaction. The Fischer–Tropsch synthesis is the heart of the GTL process, which converts natural gas (mixture of H2 and CO) to large variety of ultra clean oleﬁn, paraffin and oxygenate. An investigation was carried out to establish the performance and kinetics of an iron/manganese oxide catalyst in a fixed bed reactor by Fischer-Tropsch Synthesis (FTS) under conditions favoring the formation of gaseous and liquid hydrocarbons (P: 1-12 bar; T: 513-543 K; H2/CO:1, 1.5, 2 mol/mol; gas hourly space velocity: 4500-7000 cm3 (STP)/h/gcat). Based on the hypothesis that water inhibits the intrinsic FTS reaction rate eight kinetic models are considered: six variations of the Langmuir–Hinshelwood–Hougen–Watson representation and two empirical power law models. The kinetic data of this study were ﬁtted precisely by a kinetic form that assumed the following kinetically relevant steps, where CO dissociation is reversible and does not involve hydrogen. All hydrogenation steps are irreversible or the first hydrogenation step is slow and rate determining. The kinetic parameters were determined using Levenberg–Marquardt (LM) method.
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