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采用共沉淀方法制备了低温沉淀铁基催化剂,并在管式固定床反应器中对其动力学性能进行了考察。假定H2在催化剂表面不同的吸附形式,推导得到了基于H2解离吸附与非解离吸附的CO消耗本征动力学模型。动力学实验数据拟合以及通用全局算法优化结果表明,基于H2以解离态吸附在催化剂表面并参与费托合成反应所推导得到的动力学方程更加符合实验结果。数据拟合及统计学分析表明,在温度230℃~260℃,压力2.0 MPa~4.0 MPa,空速(2000~3000)h-1,H2/CO摩尔比0.96~2.08的操作条件范围内,在该低温沉淀铁基催化剂上的费托合成反应活化能为81.42 k J/mol,在文献所报道范围内。
The coprecipitation method was used to prepare low temperature precipitated Fe-based catalysts and its kinetic properties were investigated in a tubular fixed bed reactor. Assuming different adsorbed forms of H2 on the catalyst surface, an intrinsic kinetic model of CO consumption based on dissociative adsorption of H2 and non-dissociative adsorption was derived. The kinetic experimental data fitting and the global optimization results show that the kinetic equation based on H2 adsorbed on the catalyst surface by dissociation and participated in the Fischer-Tropsch synthesis reaction is more in line with the experimental results. Data fitting and statistical analysis showed that under the operating conditions of temperature 230 ℃ ~ 260 ℃, pressure 2.0 MPa ~ 4.0 MPa, space velocity (2000 ~ 3000) h-1 and H2 / CO molar ratio 0.96 ~ 2.08, The activation energy of the Fischer-Tropsch synthesis reaction on the low temperature precipitated iron-based catalyst is 81.42 kJ / mol, which is reported in the literature.