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Issue 4, 2012
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Towards efficient polyoxometalate encapsulation in MIL-100(Cr): influence of synthesis conditions

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Abstract

The one-pot encapsulation of phosphotungstic acid in the metal–organic framework MIL-100(Cr) has been studied under different synthesis conditions. Both conventional and microwave heating methods have been explored for three different solvent systems: pure aqueous or organic (DMF) phase and biphasic mixtures (water/2-pentanol). Biphasic systems yielded crystals with similar textural properties as those formed in water. The use of DMF as solvent promotes the formation of gel-like solids with dual porosity and enhanced accessibility. The addition of phosphotungstic acid (PTA, H3PW12O40.xH2O) to the MIL-100(Cr) synthesis mixture results in its direct encapsulation. 31P MAS NMR, elemental analysis, N2 adsorption and FT-IR spectroscopy confirm the incorporation of PTA in the sample. The highest PTA encapsulation loading (30 wt%) was obtained by synthesis with microwave heating in biphasic solvent systems (W/Cr molar ratio range between 0.5 and 0.25). Microwave irradiation decreases the time of synthesis (from 4 days to 3 hours) while the use of biphasic media preserves the PTA integrity without affecting the formation of the MOF. The interaction of PTA with the MIL-100(Cr) structure results in some loss of the Lewis acidity, while the Brønsted acidity is hardly affected.

Graphical abstract: Towards efficient polyoxometalate encapsulation in MIL-100(Cr): influence of synthesis conditions

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Supplementary files

Article information


Submitted
06 Jul 2011
Accepted
19 Jan 2012
First published
08 Feb 2012

New J. Chem., 2012,36, 977-987
Article type
Paper

Towards efficient polyoxometalate encapsulation in MIL-100(Cr): influence of synthesis conditions

J. Juan-Alcañiz, M. G. Goesten, E. V. Ramos-Fernandez, J. Gascon and F. Kapteijn, New J. Chem., 2012, 36, 977
DOI: 10.1039/C2NJ20587D

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