First stoichiometric large-pore chromium(III) silicate catalyst
authors Brandao, P; Valente, A; Ferreira, A; Amaral, VS; Rocha, J
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords chromium silicate; AV-15; large-pore; hydrothermal synthesis; oxidation reactions
keywords ALKALI-MODIFIED ZEOLITES; LIQUID-PHASE OXIDATION; MOLECULAR-SIEVES; BASE CATALYSIS; DEHYDROGENATION; HYDROPEROXIDE; CYCLOHEXANOL; SILICALITE-1
abstract The first example of a large-pore framework chromium-silicate containing stoichiometric amounts of hexa-coordinated chromium(III) has been reported. Samples were characterised by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy ultraviolet-visible (DR UV-VIS) spectroscopy, thermogravimetry (TG), adsorption of different probe molecules and model catalytic tests; AV-15 is an active catalyst for the liquid phase epoxidation of cyclohexene to cyclohexene oxide, the oxidation of cyclohexane to cyclohexanol and cyclohexanone, and the oxidative dehydrogenation of cyclohexanol to cyclohexanone, under mild reaction conditions (using H2O2, at 50 degreesC). The catalyst is recyclable without significant loss of catalytic activity, but leaching tests indicate that catalysis is mainly due to some leached chromium species. In gas phase, AV-15 exhibits mainly oxydehydrogenation activity in the conversion of ethanol, 2-propanol and cyclohexanol, using air, yielding the corresponding carbonyl product. (C) 2004 Elsevier, Inc. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 1387-1811
year published 2004
volume 69
issue 3
beginning page 209
ending page 215
digital object identifier (doi) 10.1016/j.micromeso.2004.02.011
web of science category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000220946800008
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