The process of methanol conversion to dimethyl ether (DME) in the presence of water over ZSM-5 zeolite was studied. According to the analysis of the experimental data, it was found that the presence of water inhibits the DME formation due to the competitive adsorption on active acid sites within the Langmuir–Hinshelwood models, which consider both associative and dissociative mechanisms of methanol adsorption. The thermodynamic and kinetic parameters of the DME synthesis in the presence of water are calculated, namely equilibrium constant, entropy, heat of water adsorption, and the order of reaction with water.

中文翻译：

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水对H-ZSM-5沸石甲醇转化为二甲醚速率的影响

研究了甲醇在ZSM-5沸石上在水存在下转化为二甲醚(DME)的过程。根据对实验数据的分析，发现由于在 Langmuir-Hinshelwood 模型中的活性酸位点上的竞争吸附，水的存在抑制了 DME 的形成，该模型同时考虑了甲醇吸附的缔合和解离机制。计算了在水存在下合成二甲醚的热力学和动力学参数，即平衡常数、熵、水吸附热和与水反应的顺序。