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.

中文翻译：

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使用气相支柱化策略轻松合成二维 MWW 分子筛，用于苯和 1-十二烯烷基化


通过在沸石催化剂上用 1-十二烯对苯进行烷基化反应来生产线性烷基苯 （LAB） 总是造成严重的扩散限制，而支柱化是制造具有开放孔隙率和增强扩散性能的有序沸石纳米片的重要方法。在本研究中，开发了一种气相支柱化 （VPP） 策略来制备 2D 柱状 MWW 沸石;与传统的液相柱化工艺相比，VPP 方法在嵌入步骤中仅使用 1/10 TEOS。此外，VPP 工艺不需要额外的液体溶液分离步骤，并且在 VPP 操作中不会产生液体废物。所得的 2D 柱状 MWW 沸石在苯和 1-十二烯之间的烷基化反应中显示出增强的催化活性，其中在恶劣的反应条件下（苯/1-十二烯 = 10，WHSV = 20 h^–1）在 37 小时内 1-十二烯的转化率超过 40%，并且它还表现出相当的 2-LAB 选择性 （∼68%）与传统的 2D 柱状 MWW 沸石相比。此外，通过 VPP 策略合成的 2D 柱状 MWW 分子筛具有有序的多层结构，并且在苯和 1-十二烯之间的烷基化中表现出良好的再生性能。