Pt-SO42-/ZrO2-Al2O3催化正己烷异构化反应动力学模型

采用共沉淀法制备SO₄^2-/ZrO₂-Al₂O₃，等体积浸渍法制备Pt-SO₄^2-/ZrO₂-Al₂O₃固体超强酸催化剂，采用5mL连续固定床反应装置评价了反应温度、反应压力、氢/油体积比和体积空速对Pt-SO₄^2-/ZrO₂-Al₂O₃催化剂催化正己烷临氢异构化反应活性的影响。进行拟一级动力学模型验证，建立正己烷异构化一级反应网络动力学模型。结果表明：增加反应压力和体积空速，正己烷转化率降低；随着氢/油体积比、反应温度的升高，正己烷转化率提高。在180～200℃范围内，正己烷在Pt-SO₄^2-/ZrO₂-Al₂O₃催化剂上的临氢异构化反应可以视为简单拟...

Kinetics Model of the n-Hexane Isomerization Catalyzed by Pt-SO42-/ZrO2-Al2O3

Pt-SO₄^2-/ZrO₂-Al₂O₃ was prepared by coprecipitation method and Pt-SO₄^2-/ZrO₂-Al₂O₃ solid superacid catalyst was prepared by isovolumetric impregnation method. The effects of reaction temperature, reaction pressure, hydrogen to oil volume ratio and volume space velocity on the hydroisomerization of n-hexane by Pt-SO₄^2-/ZrO₂-Al₂O₃ catalyst were evaluated using a 5 mL continuous fixed bed reactor. The pseudo first-order kinetic model was verified and a kinetic model of first-order reaction network for n-hexane isomerization was established. The results show that the conversion rate of n-hexane is decreased with the increase of reaction pressure and volume space velocity, and increased with the increase of hydrogen to oil volume ratio and reaction temperature. The hydroisomerization of n-hexane over Pt-SO₄^2-/ZrO₂-Al₂O₃ catalyst at the temperature of 180—200 ℃ can be regarded as a simple pseudo first-order reversible reaction, with the activation energy (E_a) of 81.84 kJ/mol and pre-exponential factor (A) of 1.57×10⁹ h^-1. The kinetic model of pseudo first-order reaction network is well fitted with the experimental results, and the activation energy of each step is between 76 and 127 kJ/mol.