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2D-to-disguised 3D materials with built-in acid sites: H+-[Al]-RUB-18

Abstract

Al3+ hetero ions have been incorporated into the silicate layers of Na-RUB-18 in three different molar ratio Si/AlICP (22, 40 and 42) through a post-synthesis procedure under hydrothermal conditions. A systematic characterization (XRD, 29Si NMR, 27Al NMR and SEM) showed that these Na-[Al]-RUB-18 layered aluminosilicates are free from impurities, 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 tetrahedral position and the layered sample with molar ratio Si/AlICP = 22 has displayed also in octahedral coordination. These layered aluminosilicates which consist in lamella stacking in c direction had their interlayer space expanded by ion exchange with CTA+. The swollen samples were pillared with TEOS, as SiO2 pillars precursor, and octylamine, as hydrolyzing agent and co-surfactant. Pillared materials presented type IV isotherms with a BET surface area in the range 223–323 m2 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 7–12 m2 g-1. Additionally, the acidity present in the layers of these pillared solids was proved by the in situ ethanol dehydration monitored by FTIR.

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Publication details

The article was received on 20 Jun 2017, accepted on 05 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02241G
Citation: Dalton Trans., 2017, Accepted Manuscript
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    2D-to-disguised 3D materials with built-in acid sites: H+-[Al]-RUB-18

    H. de Oliveira Pastore and F. S. O. Ramos, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02241G

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