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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
Published on: May 11, 2017
Unusual coordination state of cobalt ions in zeolites modified by aluminum chloride
M I Shilina1, G Yu Vasilevskii, T N Rostovshchikova
1Department of Chemistry, Lomonosov Moscow State University, 1-3, Leninskiye Gory, GSP-1 Moscow, 119991, Russia. mish@kinet.chem.msu.ru.
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 Co(2+) 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.
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