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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Pillaring of layered zeolite precursors with ferrierite topology leading to unusual molecular sieves on the micro/mesoporous border
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Pillaring of layered zeolite precursors with ferrierite topology leading to unusual molecular sieves on the micro/mesoporous border

机译：分层沸石前体的柱状与细胞石颗粒体导致微/介孔边界上不寻常的分子筛

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Layered zeolite materials with FER layer topology can produce various condensed and expanded structures including zeolite frameworks, FER and CDO, their interlayer expanded forms (IEZ), and organic-intercalated and pillared derivatives. This work concerns pillaring of the surfactant-swollen derivative with a gallery height of ca. 2.5 nm between layers by treatment with tetraethylorthosilicate (TEOS) at room and elevated temperatures. The materials obtained at 100 degrees C and higher showed unusual properties including 2 nm pores on the micro/mesoporous border and disordered layer packing indicated by the absence of distinct low angle interlayer peaks at d-spacing 3 nm (similar to 3 degrees 2 theta Cu K alpha radiation) in the X-ray diffraction pattern (XRD). TEOS treatment at room temperature produced a pillared molecular sieve with the expected mesoporous characteristics, namely a pore size of around 3 nm and a high intensity low angle (001) peak at 2.3 degrees 2 theta, and a d-spacing of 3.8 nm, in the XRD. The characterization aiming to elucidate the nature of the obtained unusual products included gas adsorption isotherms, aberration corrected (Cs-corrected) Scanning Transmission Electron Microscopy (STEM) studies and Si-29 solid state NMR. BET surface area values decreased with the temperature of TEOS treatment from approximately 1200 m(2) g(-1) to similar to 900 and 600 m(2) g(-1), at room temperature, 100 degrees C, and 120 degrees C, respectively. The Si-29 solid state NMR revealed the presence of both Q(3) ((SiO)(3)SiOX, X = H or minus charge) and Q(4) ((SiO)(4)Si) centers giving separated signals up to the pillaring step. After pillaring at 100 degrees C and calcination, the nominal intensity ratios Q(4) : Q(3) were 2.17 and 2.61 but the signals were merged into one broad peak indicating the structural heterogeneity of Si-O coordination. The microscopy showed the presence of FER layers in the samples but the overall structure and composition were not
机译：与FER层拓扑层状沸石材料可以生产各种冷凝和膨胀结构，包括沸石骨架，FER和CDO，它们的层间扩展形式（IEZ）和有机插层和柱撑衍生物。这项工作的关注与CA的画廊高度表面活性剂溶胀衍生物的柱撑在室温通过用原硅酸四乙酯（TEOS）处理层和升高的温度之间2.5纳米。在100℃下获得的材料和较高的显示不寻常的性能，包括2 50nm孔上的微/孔边界和无序层包装指示通过不存在明显的低角度的夹层在d间距＆GT峰值; 3纳米（类似于3度2 THETACuKα辐射）在X射线衍射图（XRD）。 TEOS处理在室温下产生的与所期望的孔特性的柱分子筛，即波长约3的孔径和高强度的低角度在2.3度2θ（001）峰，和d间距的3.8纳米，在X射线衍射。表征旨在阐明包含气体吸附等温线获得的不寻常的产品的性质，像差校正（CS-校正的）扫描透射电子显微镜（STEM）的研究和Si-29固态NMR。 BET表面积值与TEOS处理的温度降低从约1200米（2）克（-1），以类似于900和600米（2）克（-1），在室温下，100℃，和120度C，分别。在Si-29固态NMR表明两个Q的存在（3）（（SIO）（3）的SiOX，X = H或负电荷）和Q（4）（（SIO）（4）Si）的中心给予分离的信号直到柱撑一步。在100℃和焙烧后柱撑，标称强度比Q（4）：Q（3）分别为2.17和2.61，但信号被合并为一个宽峰表示Si-O的协调的结构异质性。该显微镜显示FER层的存在的样品中，但整体结构和组合物不

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