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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >2D-to-disguised 3D materials with built-in acid sites: H+-[Al]-RUB-18
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2D-to-disguised 3D materials with built-in acid sites: H+-[Al]-RUB-18

机译：2D-um-伪装的3D材料，内置酸基地：H + - [Al] -Rub-18

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摘要

Al3+ heteroions have been incorporated into the silicate layers of Na-RUB-18 in three different molar ratios Si/AlICP (22, 40 and 42) through a post-synthesis procedure under hydrothermal conditions. Systematic characterization (XRD, Si-29 NMR, 27Al NMR and SEM) showed that these Na-[Al]-RUB-18 layered aluminosilicates are free from impurities, and the aluminum did not affect the crystallinity of the material, and also did not change its morphology. 27Al NMR showed that aluminum was incorporated in the tetrahedral position and the layered sample with molar ratio Si/AlICP = 22 has also displayed octahedral coordination. These layered aluminosilicates which consist of lamella stacking in the c direction had their interlayer space expanded by ion exchange with CTA(+). The swollen samples were pillared with TEOS, as the SiO2 pillar precursor, and octylamine, as the hydrolyzing agent and co-surfactant. Pillared materials presented type IV isotherms with a BET surface area in the range of 223-323 m(2) g(-1) and mesoporous with 2-4 nm, while their layered precursors Na-[Al]-RUB-18 showed type II isotherms with a BET surface area in the range of 7-12 m(2) g(-1). Additionally, the acidity present in the layers of these pillared solids was proved by in situ ethanol dehydration monitored by FTIR.
机译：通过在水热条件下通过合成后方法掺入三种不同摩尔比Si / AliCP（22,40和42）中的Na-Rub-18的硅酸盐层中掺入硅酸盐层中。系统表征（XRD，Si-29 NMR，27AL NMR和SEM）表明，这些Na-[Al] -Rub-18层状硅酸盐没有杂质，铝不影响材料的结晶度，也没有改变它的形态。图27AL NMR显示铝在四面体位置掺入，并且具有摩尔比Si / AlicP = 22的层状样品也显示了八面体配位。这些层状硅铝酸盐由C方向上的薄片组成，其层间空间通过与CTA（+）的离子交换而膨胀。溶胀的样品用TEOS柱，作为SiO2柱前体，也是水解剂和共表面活性剂。柱状材料在223-323m（2）g（-1）和介孔中呈现IV型等温线，其具有2-4nm的介孔，而其层状前体Na-[Al] -Rub-18显示II等温线的BET表面积在7-12m（2）g（-1）的范围内。另外，通过FTIR监测的原位乙醇脱水，证明了这些柱状固体层中存在的酸度。

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