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首页> 外文期刊>Advanced Functional Materials >Siliceous ZSM-5 Membranes by Secondary Growth of b-Oriented Seed Layers
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Siliceous ZSM-5 Membranes by Secondary Growth of b-Oriented Seed Layers

机译：b定向种子层的次生硅质ZSM-5膜

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摘要

A modified seeded growth procedure, which allowed us to prepare the first functional b-oriented siliceous ZSM-5 membrane (Z. Lai et al., Science, 2003, 300, 456), is described and discussed in detail. The procedure involves growing a b-oriented ZSM-5 seed monolayer into a dense b-oriented membrane. Preservation of the orientation is achieved by enhancing the growth rate of siliceous ZSM-5 crystals along the b-axis using trimer-TPAOH (bis-N,N-(tripropylammoniumhexamethylene) di-N,N-propylammonium trihydroxide) as the structure-directing agent (SDA). Under similar synthesis conditions but using monomer-TPAOH (tetrapropylammonium hydroxide) as the SDA for the secondary growth of the b-oriented seed layer, two other films with mixed grain orientations, namely b&a- or b&a&h0h/c-oriented ZSM-5 membranes were obtained depending on temperature of the secondary growth. Membrane microstructures were characterized by X-ray diffraction, pole figure analysis, scanning electron microscopy, fluorescent confocal optical microscopy, electron probe microanalysis, and X-ray photoelectron spectroscopy. The separation performance of the three types of membranes was tested by using a mixture of xylene isomers. Significant improvement in both permeance and separation factor is achieved by the b-oriented siliceous ZSM-5 membrane compared to the other two types of membranes described here or other reported ZSM-5 membranes in the literature. The permeation results indicate that the membrane performance depends strongly on membrane microstructure.
机译：对改良的种子生长程序进行了描述和讨论，该程序使我们能够制备第一种功能性的b取向硅质ZSM-5膜（Z. Lai等，Science，2003，300，456）。该过程涉及将b定向的ZSM-5种子单层生长成致密的b定向膜。通过使用三聚体-TPAOH（双-N，N-（三丙基铵六亚甲基）二氢，N-N-丙基丙基氢氧化铵）作为结构指导，通过提高硅质ZSM-5晶体沿b轴的生长速率来保持取向。代理商（SDA）。在相似的合成条件下，但使用单体-TPAOH（氢氧化四丙基铵）作为b取向种子层的二次生长的SDA，另外两个具有混合晶粒取向的膜，即b＆a-或b＆a＆h0h / c取向的ZSM-5膜取决于二次生长的温度。通过X射线衍射，极图分析，扫描电子显微镜，荧光共聚焦光学显微镜，电子探针显微分析和X射线光电子能谱表征了膜的微观结构。通过使用二甲苯异构体的混合物测试了三种类型的膜的分离性能。与本文所述的其他两种类型的膜或文献中其他已报道的ZSM-5膜相比，b取向硅质ZSM-5膜可实现渗透率和分离系数的显着改善。渗透结果表明，膜的性能在很大程度上取决于膜的微观结构。

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