Effects of the Pore Structure and Acid–Base Property of X Zeolites on Side-Chain Alkylation of Toluene with Methanol,Industrial & Engineering Chemistry Research

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Effects of the Pore Structure and Acid–Base Property of X Zeolites on Side-Chain Alkylation of Toluene with Methanol
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-17 , DOI: 10.1021/acs.iecr.1c02179
He Han ₁ , Min Liu ₁ , Hong Yang ₂ , Chuan Shi ₁ , Shutao Xu ₃ , Yingxu Wei ₃ , Zhongmin Liu ₃ , Chunshan Song _{1,

4} , Xinwen Guo ₁

Affiliation

One of the potential processes for making styrene monomers is side-chain alkylation of toluene with methanol, and X zeolites (a common type of faujasite) have been identified as one of the most suitable catalysts for this reaction. In this work, a series of X zeolites with different micro- and meso-porosities and acid–base properties are prepared by post-treatments of NaX zeolite and their catalytic performances for the side-chain alkylation of toluene with methanol are evaluated. This study shows that intracrystalline mesopores could be introduced into the NaX zeolite while retaining adequate microporosity through controlling the intensity and sequence of ammonium-exchange (AE) and/or dealumination (DA) post-treatments. The loss in basicity of the resulting mesoporous X zeolites due to AE and/or DA treatments could be compensated and even enhanced by the subsequent cesium modifications. As catalysts for the side-chain alkylation reaction, the study shows that while introducing appropriate mesopores into X zeolites enhances molecular diffusion, the restriction effect of micropores is proven to be critical for their catalytic activity. Moreover, it is the acid–base property rather than the pore structure of the post-treated X zeolites determining their catalytic activity and selectivity for the side-chain alkylation reaction.

中文翻译：

X沸石的孔结构和酸碱性质对甲苯与甲醇侧链烷基化的影响

制备苯乙烯单体的潜在方法之一是甲苯与甲醇的侧链烷基化，X 沸石（一种常见的八面沸石）已被确定为最适合该反应的催化剂之一。在这项工作中，通过对 NaX 沸石进行后处理制备了一系列具有不同微孔和介孔以及酸碱性质的 X 沸石，并评估了它们对甲苯与甲醇侧链烷基化的催化性能。该研究表明，通过控制铵交换 (AE) 和/或脱铝 (DA) 后处理的强度和顺序，可以将晶内中孔引入 NaX 沸石，同时保持足够的微孔率。由于 AE 和/或 DA 处理而导致的所得介孔 X 沸石碱度的损失可以通过随后的铯改性得到补偿甚至增强。作为侧链烷基化反应的催化剂，该研究表明，虽然在 X 沸石中引入适当的介孔可增强分子扩散，但微孔的限制效应被证明对其催化活性至关重要。此外，决定其侧链烷基化反应的催化活性和选择性的是经过后处理的 X 沸石的酸碱性质而不是孔结构。事实证明，微孔的限制作用对其催化活性至关重要。此外，决定其侧链烷基化反应的催化活性和选择性的是经过后处理的 X 沸石的酸碱性质而不是孔结构。事实证明，微孔的限制作用对其催化活性至关重要。此外，决定其侧链烷基化反应的催化活性和选择性的是经过后处理的 X 沸石的酸碱性质而不是孔结构。

更新日期：2021-10-13

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