Facile Synthesis of Two-Dimensional MWW Zeolites with Vapor-Phase Pillarization Strategy for Alkylation of Benzene and 1-Dodecene

IF 3.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2024-12-24 DOI:10.1021/acs.iecr.4c03177

Shengzhi Gan, Baoyi Lu, Zhenyuan Zou, Manna Wang, Sihao Lin, Xingxing Zeng, Baoyu Liu

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Abstract

The production of linear alkylbenzene (LAB) by alkylation of benzene with 1-dodecene over zeolite catalysts always imposes serious diffusion limitations, while pillarization is an essential way for fabrication of ordered zeolite nanosheets with open porosity and enhanced diffusion property. In this study, a vapor-phase pillarization (VPP) strategy is developed to prepare the 2D pillared MWW zeolites; the VPP method only uses 1/10 TEOS in the intercalation step, in comparison with the conventional liquid-phase pillarization process. Besides, the additional separation step from liquid solution is not required in the VPP process, and no liquid waste is produced in the VPP operation. The resultant 2D pillared MWW zeolite shows enhanced catalytic activity in the alkylation between benzene and 1-dodecene, in which the conversion of 1-dodecene is more than 40% within 37 h under the harsh reaction conditions (benzene/1-dodecene = 10, WHSV = 20 h^–1), and it also exhibits comparable selectivity of 2-LAB (∼68%), in comparison with that of traditional 2D pillared MWW zeolites. Furthermore, the 2D pillared MWW zeolites synthesized via the VPP strategy possess an ordered multilamellar structure and exhibit good regeneration performance in the alkylation between benzene and 1-dodecene.

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用气相柱化策略快速合成二维MWW分子筛用于苯和1-十二烯的烷基化反应

沸石催化剂上苯与1-十二烯的烷基化法制备线性烷基苯（LAB）存在严重的扩散限制，而柱化是制备孔隙疏松、扩散性能增强的有序沸石纳米片的重要途径。本研究采用气相柱化（VPP）法制备了二维柱状MWW沸石；与传统液相柱化工艺相比，VPP方法在插层步骤中只使用了1/10的TEOS。此外，在VPP工艺中不需要额外的液液分离步骤，VPP操作中不产生液体废物。所制得的二维柱状MWW沸石在苯与1-十二烯的烷基化反应中表现出增强的催化活性，在恶劣的反应条件下（苯/1-十二烯= 10,WHSV = 20 h - 1）， 37 h内1-十二烯的转化率超过40%，与传统的二维柱状MWW沸石相比，它也具有相当的2-LAB选择性（~ 68%）。此外，通过VPP策略合成的二维柱状MWW分子筛具有有序的多层结构，并且在苯与1-十二烯的烷基化反应中表现出良好的再生性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.