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Issue 9, 2001
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Synthesis and characterisation of chromium-substituted ETS-10

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Abstract

A series of microporous chromium-containing ETS-10 (ETCrS-10) with different Cr/Ti molar ratios have been synthesised and characterised by energy dispersive absorption of X-rays (EDAX), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption measurements, diffuse-reflectance ultraviolet spectroscopy (DR-UV), electron paramagnetic resonance (EPR) and 29Si magic-angle-spinning nuclear magnetic resonance (MAS NMR). The diffractograms of the as-synthesised ETCrS-10 materials indicate that the ETS-10 structure has remained intact upon Cr substitution. DR-UV and EPR reveal that the as-prepared ETCrS-10 samples contain Cr3+ in octahedral coordination. The resonances in the 29Si MAS NMR spectra of ETCrS-10 are considerably broader than those of ETS-10 and such a broadening may relate to isomorphous substitution of Cr for Ti in the ETS-10 framework. The acid–base properties of ETCrS-10 materials are responsible for the high dehydrogenation activity in the conversion of isopropanol to acetone and dehydration activity in the conversion of tert-butanol to isobutene. Ethanol oxidation over ETCrS-10 yields acetaldehyde as a main product.

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Publication details

The article was received on 21 Aug 2000, accepted on 12 Mar 2001 and first published on 03 Apr 2001


Article type: Paper
DOI: 10.1039/B006828O
Phys. Chem. Chem. Phys., 2001,3, 1773-1777

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    Synthesis and characterisation of chromium-substituted ETS-10

    P. Brandão, A. Philippou, A. Valente, J. Rocha and M. Anderson, Phys. Chem. Chem. Phys., 2001, 3, 1773
    DOI: 10.1039/B006828O

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