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Kinetics of CO hydrogenation over coprecipitated cobalt-alumina

机译:共沉淀钴-氧化铝上CO加氢动力学

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The kinetics of CO hydrogenation over coprecipitated 36 wt% Co/Al2O3 was studied in a fixed-bed microreactor at atmospheric pressure. Intrinsic kinetic data were obtained in the initial rate region using four different CO concentrations and two different H-2/CO ratios over the 473-523 K temperature range. The surface carbide mechanism. with dissociative adsorption of hydrogen as the rate controlling step gives the most plausible kinetic model among the eight different models tested. C-1-C-4 production rates are found to be strongly influenced by temperature, and optimum C-1-C-4 hydrocarbon selectivity is obtained at 508 K. The activation energy for CO consumption and CH4 formation are calculated as 74 +/- 2 kJ mol(-1) and 84 +/- 2 kJ mol(-1) respectively.
机译:在大气压下,在固定床微反应器中研究了共沉淀36 wt%Co / Al2O3上的CO加氢动力学。在473-523 K温度范围内,使用四种不同的CO浓度和两种不同的H-2 / CO比,在初始速率区域获得了固有的动力学数据。表面碳化机理。通过氢的解离吸附作为速率控制步骤,可以得出八个测试模型中最合理的动力学模型。发现C-1-C-4的生产率受温度的强烈影响,并且在508 K时可获得最佳的C-1-C-4烃选择性。CO消耗和CH4形成的活化能计算为74 + / -2 kJ mol(-1)和84 +/- 2 kJ mol(-1)。

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