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Issue 35, 2015
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Syntheses, structure solutions, and catalytic performance of two novel layered silicates

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Abstract

Two novel layered silicates, PKU-13 and PKU-13a, were hydrothermally synthesized by using trimethylpropylammonium hydroxide as the structure directing agent (SDA). Their structures were solved by using powder X-ray diffraction data in combination with electron diffraction technique and NMR spectroscopy. These two silicates are built from the same r52 layer in different stacking modes: the adjacent r52 layers in PKU-13a have a 0.5b + 0.68c shift compared with those in PKU-13. The difference is due to the SDA cations located between the layers. The SDA cations exist as a monolayer in the structure of PKU-13, and link the adjacent layers by Coulomb actions in combination with strong hydrogen bonds. In PKU-13a, the SDA cations present in the bi-layer expend the distance between layers and destroy the inter-layer hydrogen bonds. PKU-13a can transform to PKU-13 after treatment with acetic acid solution. The co-existence of intra-layer hydrogen bonds in PKU-13 interfere in its condensation to an ordered crystalline microporous framework. Both PKU-13 and PKU-13a exhibit good catalytic activities as base catalysts in the Knoevenagel condensation reaction.

Graphical abstract: Syntheses, structure solutions, and catalytic performance of two novel layered silicates

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Article information


Submitted
03 Feb 2015
Accepted
10 Jul 2015
First published
13 Jul 2015

Dalton Trans., 2015,44, 15567-15575
Article type
Paper
Author version available

Syntheses, structure solutions, and catalytic performance of two novel layered silicates

J. Liang, J. Su, Y. Chen, Z. Li, K. Li, H. Zhang, X. Zou, F. Liao, Y. Wang and J. Lin, Dalton Trans., 2015, 44, 15567
DOI: 10.1039/C5DT00487J

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