The alkylation of benzene with methanol is an important synthetic method that is widely used in various chemical production processes. However, obtaining a high selectivity for xylene and annihilating the MTO side reaction remain challenges. In this work, a Ru/HZSM-5 catalyst was prepared using ZSM-5 as the precursor by a chemical precipitation method. Both XRD and TEM confirmed that Ru nanoparticles were evenly dispersed on the surface of the ZSM-5. The catalytic performance of benzene alkylation with methanol on the Ru/HZSM-5 catalyst was investigated. The results showed that the Ru/HZSM-5 catalyst could completely annihilate the MTO side reaction with a high conversion efficiency of benzene and selectivity for xylene, which resulted from the large gap between the transgression energy value of Ru and the ionization potential value of benzene, and the acidity of the catalyst changed greatly. These findings may offer not only a new and efficient multifunctional catalyst for benzene alkylation but also fundamental insight into the catalytic mechanism of the Ru/HZSM-5 catalyst.

中文翻译：

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Ru/HZSM-5控制苯、甲醇空间吸附位姿实现定向烷基化反应策略研究

苯与甲醇的烷基化是一种重要的合成方法，广泛应用于各种化工生产过程。然而，获得二甲苯的高选择性并消除 MTO 副反应仍然是挑战。本工作以ZSM-5为前驱体，采用化学沉淀法制备了Ru/HZSM-5催化剂。XRD和TEM均证实Ru纳米粒子均匀分散在ZSM-5的表面上。研究了Ru/HZSM-5催化剂上苯与甲醇烷基化反应的催化性能。结果表明，Ru/HZSM-5催化剂能完全消除MTO副反应，且苯的转化效率高，二甲苯选择性高，这是由于Ru的海侵能值与苯的电离势值差距较大所致。 ，催化剂的酸度变化较大。这些发现不仅可以为苯烷基化提供一种新型高效的多功能催化剂，而且可以为Ru/HZSM-5催化剂的催化机理提供基础见解。