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Partial oxidation of ethanol over ZrO2-supported vanadium catalysts
Authors: Hidalgo J. M. | Tišler Z. | Bulánek Roman | Čičmanec Pavel | Raabová Kateřina | Kubička D.
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Reaction Kinetics Mechanisms and Catalysis
Publisher name: Springer
Place: Heidelberg
Page from-to: 161-173
Titles:
Language Name Abstract Keywords
cze Parciální oxidace etanolu na V-ZrO2 katalyzátorech Vanadiové katalyzátory na nosiči ZrO2 byly připraveny impregnací dvou odlišných nosičů ZrO2 mokrou cestou za použití roztoku metavanadičnanu amonného. Katalyzátory byly charakterizovány pomocí N2-fyzisorpce, XRF, XRD a Ramanovy spektroskopie. Byly stanoveny jejich texturní vlastnosti, chemické složení a povaha druhů vanadu. Dále byly testovány v parciální oxidaci etanolu na acetaldehyd v reaktoru s pevným ložem při atmosférickém tlaku. etanol; oxidace; acetaldehyd; vanad; ZrO2
eng Partial oxidation of ethanol over ZrO2-supported vanadium catalysts Zirconia-supported vanadium catalysts were prepared by the wet impregnation of two different zirconia supports using ammonium metavanadate in aqueous hydrogen peroxide solution. The catalysts were characterized by N-2 physisorption, X-ray fluorescence analysis (XRF), X-ray diffraction (XRD) and Raman spectroscopy to determine their textural properties, chemical composition and the nature of vanadium species. The partial oxidation of ethanol to acetaldehyde was carried out in a fixed bed reactor at atmospheric pressure varying the weight-hourly space velocity and temperature in the range 1-4 h(-1) and 150-250 degrees C, respectively. In addition to acetaldehyde, a range of oxygenated and deoxygenated by-products was observed. Diethyl ether and ethyl acetate were detected in the reaction mixture with low and almost constant amount. These products are formed through a homogeneous reaction in the free volume of reactor or pre-heating zone irrespective of catalyst used. Vanadium species anchored on the zirconia surface are able to activate ethanol molecules already at 150 degrees C with the high selectivity to acetaldehyde. A comparison of vanadium speciation and catalytic results led to conclusion that oligomeric vanadium species and small oxide clusters have no deterioration effect on acetaldehyde selectivity. Ethanol; Oxidation; Acetaldehyde; Vanadium; Zirconium oxide

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