The reactions involved in methanol-to-hydrocarbon (MTH) conversion are complex and simultaneous. In this study, the influence of the temperature and weight hourly space velocity (WHSV) was investigated on the MTH kinetic model, which was built on the hydrocarbon pool mechanism using a catalyst of Ca-ZSM-5 (Ca-ZS-5). The existing kinetic model to describe the MTH process is a seven-lump model. The application of any kinetic model for the MTH reaction using the Ca-ZS-5 catalyst has not yet been studied. To obtain high accuracy, new kinetic models were constructed, namely, four- and eight-lump kinetic models. The four-lump model contained oxygenate, olefins, C₅+ and paraffin. The eight-lump kinetic model included methanol, dimethyl ether, ethylene, propylene, butylene, C₁–C₄ (sum of CH₄, C₂H₆, C₃H₈, i-C₄H₁₀, and n-C₄H₁₀), C₅+ (sum of i-C₅H₁₂, n-C₅H₁₂, and 1-C₅H₁₂), and coke. The MTH experiment was performed at 673–773 K and WHSV values of 4.75, 9.5, and 14.25 h^–1. The model simulation was carried out by fitting the model equation and experimental data to obtain kinetic parameters using MATLAB software. The results indicated that the four- and eight-lump kinetic models can accurately explain the behavior of the reaction kinetics, especially on the effect of the temperature and WHSV.

中文翻译：

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Ca-ZSM-5催化剂上甲醇制烃新动力学模型的建立

甲醇转化为烃（MTH）的反应复杂且同步。在这项研究中，研究了温度和重量时空速度（WHSV）对MTH动力学模型的影响，该模型建立在使用Ca-ZSM-5（Ca-ZS-5）催化剂的碳氢化合物池机理上。现有的描述MTH过程的动力学模型是七块模型。尚未研究使用Ca-ZS-5催化剂进行MTH反应的任何动力学模型的应用。为了获得高精度，构建了新的动力学模型，即四块和八块动力学模型。四块模型包含氧化物，烯烃，C ₅ +和石蜡。八峰动力学模型包括甲醇，二甲醚，乙烯，丙烯，丁烯，C ₁ -C ₄（CH ₄，C ₂ H ₆，C ₃ H ₈，iC ₄ H ₁₀和n -C ₄ H _10的总和），C ₅ +（iC ₅ H ₁₂，n -C ₅ H ₁₂和1的总和-C ₅ H ₁₂）和焦炭。MTH实验在673–773 K下进行，WHSV值为4.75、9.5和14.25 h ^–1。通过使用MATLAB软件拟合模型方程和实验数据来获得动力学参数，从而进行了模型仿真。结果表明，四块和八块动力学模型可以准确地解释反应动力学的行为，特别是温度和WHSV的影响。