Effect of H-ZSM-5 zeolite content on the intrinsic kinetics of methanol dehydration to dimethyl ether over H-ZSM-5/Al2O3 molded catalyst,Reaction Chemistry & Engineering

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Effect of H-ZSM-5 zeolite content on the intrinsic kinetics of methanol dehydration to dimethyl ether over H-ZSM-5/Al2O3 molded catalyst
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-12-06 , DOI: 10.1039/d1re00468a
Alexey Zhokh ₁ , Andrey Trypolskyi ₁ , Valentina Gritsenko ₁ , Peter Strizhak ₁

Affiliation

A series of H-ZSM-5/Al₂O₃ molded catalysts with various zeolite/alumina ratios has been prepared and their catalytic activity in methanol dehydration to dimethyl ether has been studied. Based on the Langmuir–Hinshelwood formalism, several kinetic models involving associative and dissociative mechanisms of methanol adsorption have been investigated. The kinetic parameters of the models have been estimated. The mechanism of methanol adsorption (associative or dissociative) is not sensitive to catalyst composition. The latter also affects the activation energy and methanol adsorption enthalpy, which are associated with the dilution of zeolite acid sites in the alumina matrix. In contrast, preexponential factors exhibit no sensitivity to catalyst composition.

中文翻译：

H-ZSM-5沸石含量对H-ZSM-5/Al2O3模制催化剂甲醇脱水制二甲醚本征动力学的影响

制备了一系列不同沸石/氧化铝比的H-ZSM-5/Al ₂ O ₃模制催化剂，并研究了它们在甲醇脱水制二甲醚中的催化活性。基于 Langmuir-Hinshelwood 形式主义，已经研究了几种涉及甲醇吸附的缔合和解离机制的动力学模型。已经估计了模型的动力学参数。甲醇吸附（缔合或解离）的机制对催化剂组成不敏感。后者也影响活化能和甲醇吸附焓，这与氧化铝基质中沸石酸位点的稀释有关。相反，指前因子对催化剂组成没有敏感性。

更新日期：2021-12-16

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