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Issue 29, 2015
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Unusual coordination state of cobalt ions in zeolites modified by aluminum chloride

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Abstract

Co- and Al-modified zeolites (Al–Co–ZSM-5) were prepared by solid-state ion exchange with cobalt acetate or chloride, followed by AlCl3 immobilization from anhydrous toluene solution. Based on data from XRD, X-ray absorption (XANES/EXAFS), X-ray photoelectron spectroscopy and DRIFT spectral studies of adsorbed probe molecules (carbon monoxide, ethane), a new cobalt electronic state, bonded with surface aluminum atoms through oxygen and chlorine atoms, arises on the surface of Al–Co–ZSM-5. A new band at 2192 cm−1 appears in the DRIFT spectrum, shifted to lower frequencies compared to CO complexes with isolated Co2+ cations (2205 cm−1). Spectral data of the ethane adsorption (new strong bands in the range of 2740–2770 cm−1) prove the existence of specific centers of alkane activation on coordinately unsaturated cobalt cations, resulting in the interaction with aluminum chloride.

Graphical abstract: Unusual coordination state of cobalt ions in zeolites modified by aluminum chloride

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Publication details

The article was received on 30 Apr 2015, accepted on 11 Jun 2015 and first published on 11 Jun 2015


Article type: Paper
DOI: 10.1039/C5DT01640A
Citation: Dalton Trans., 2015,44, 13282-13293
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    Unusual coordination state of cobalt ions in zeolites modified by aluminum chloride

    M. I. Shilina, G. Yu. Vasilevskii, T. N. Rostovshchikova and V. Yu. Murzin, Dalton Trans., 2015, 44, 13282
    DOI: 10.1039/C5DT01640A

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