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Supported Zeolite Beta Layers via an Organic Template-Free Preparation Route

机译：通过无有机模板的制备路线支持的沸石Beta层

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摘要

Layers of high silica zeolites, synthesized with an organic structure directing agent (OSDA) and grown onto porous support structures, frequently suffer from the thermal stress during the removal of OSDA via the calcination process. The different thermal expansion coefficients of the zeolite and the support material, especially when stainless steel is used as a support, causes enormous tension resulting in defect formation in the zeolite layer. However, the calcination is an easy procedure to decompose the OSDA in the pore system of the zeolite. Recently, methods to synthesize zeolite beta without the use of an organic structure directing agent have been described. In the present study, a seed-directed synthesis is used to prepare OSDA-free zeolite beta layers on stainless steel supports via an in situ preparation route. For the application as membrane, a porous stainless steel support has been chosen. The beta/stainless steel composites are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). To prove its possible application as a membrane, the beta/stainless steel composites were also tested by single gas permeances of H2, He, CO2, N2, and CH4.
机译：通过有机结构定向剂（​​OSDA）合成并生长到多孔载体结构上的高硅沸石层通常在通过煅烧过程除去OSDA期间遭受热应力。沸石和载体材料的不同的热膨胀系数，特别是当使用不锈钢作为载体时，会引起巨大的张力，从而导致在沸石层中形成缺陷。然而，煅烧是在沸石的孔系统中分解OSDA的简单程序。最近，已经描述了在不使用有机结构导向剂的情况下合成β沸石的方法。在本研究中，采用种子定向合成法通过原位制备途径在不锈钢载体上制备不含OSDA的沸石β层。为了用作膜，已经选择了多孔不锈钢载体。 β/不锈钢复合材料的特征在于X射线衍射（XRD）和扫描电子显微镜（SEM）。为了证明其可能作为膜的应用，还通过H2，He，CO2，N2和CH4的单一气体渗透率对β/不锈钢复合材料进行了测试。

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