Zeolite films: a new synthetic approach
Zeolite films: a new synthetic approach
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DOI：
10.1039/c2ta00528j
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Sankar, Gopinathan
中科院分区：
文献类型：
--
作者：
Bhachu, Davinder S.;Smith, Andrew J.;Sankar, Gopinathan
首次采用化学气相沉积(CVD)和水热相结合的方法制备了致密、粘结的沸石薄膜。这种新方法使用CVD方法沉积致密的无定形二氧化硅或钛掺杂二氧化硅薄膜，然后在有机结构导向剂的作用下通过水热过程将其转化为晶态纳米孔沸石。为了验证该方法的性能，制备了Silicalite-1(S-1)和TiSilicalite-1(TS-1)沸石。X射线衍射(XRD)和扫描电子显微镜(SEM)均显示了晶态沸石薄膜的存在，并具有良好的形貌。TiK边X射线吸收光谱(XAS)表明，金属离子存在于沸石基质的骨架中，以及非晶态和晶态沸石薄膜中孤立的四面体位置。通过与正己烯和过氧化氢反应，薄膜中的孔和钛中心也被分子接触到。
Dense, adhesive zeolitic films were made for the first time by combining chemical vapour deposition (CVD) and hydrothermal methods. This new method uses a CVD process to deposit dense amorphous silica or titanium doped silica films which are then converted to a crystalline nanoporous zeolite by a hydrothermal process using an organic structure directing agent. To demonstrate the capability of the method, silicalite-1 (S-1) and titanium silicalite-1 (TS-1) zeolites were prepared. Both X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed the presence of crystalline zeolite films with well-defined morphology. Ti K-edge X-ray absorption spectroscopy (XAS) revealed the presence of the metal ions in the framework of the zeolitic matrix and in isolated, tetrahedral sites both in the amorphous and crystalline zeolite films. Both the pores and the titanium centres in the films were also shown to be accessible for molecules, by reacting with n-hexene and H2O2.