Chemistry, Physics and Technology of Surface, 2012, 3 (3), 273-282.

Study on Cr(acac)3 Thermolysis at SiO2 and Al2O3 Surfaces by Temperature Programmed Desorption Mass Spectrometry



L. O. Davydenko, B. G. Mischanchuk, A. G. Grebenyuk, V. O. Pokrovskiy, Yu. V. Plyuto

Abstract


The mechanism of thermolysis of chromium (III) acetylacetonate Cr(acac)3 molecules adsorbed on silica and alumina surfaces has been studied by temperature programmed desorption mass spectrometry. It has been found that the thermolysis of Cr(acac)3 on silica surface occurs due to substitution of the support hydroxyl groups for hydrogen bonded ligands and dimerization of free acetylacetonate ligands by migration of hydrogen atom of methyl group to oxygen atom of enol and carbonyl groups followed by decomposition of dimeric macroligands and single acetylacetonate ligands with elimination of small molecules. The thermolysis of Cr(acac)3 on alumina surface occurs due to dimerization of free acetylacetonate ligands via migration of hydrogen atom of methyl group to oxygen atom of carbonyl group followed by decomposition of dimeric macroligands and single acetylacetonate ligands with elimination of small molecules.

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Copyright (©) 2012 L. O. Davydenko, B. G. Mischanchuk, A. G. Grebenyuk, V. O. Pokrovskiy, Yu. V. Plyuto

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