Journal
ACS CATALYSIS
Volume 2, Issue 4, Pages 604-612Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs200554h
Keywords
ethanol; acetic acid; oxidation; heterogeneous catalysis; ruthenium hydroxide catalysts
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Heterogeneous catalyst systems comprising ruthenium hydroxide supported on different carrier materials, titania, alumina, ceria, and spinel (MgAl2O4), were applied in selective aerobic oxidation ethanol to form acetic acid, an important bulk chemical and food ingredient. The catalysts were characterized by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and nitrogen physisorption and utilized in the oxidation of 2.5-50 wt % aqueous ethanol solutions at elevated temperatures and pressures. The effects of Ru metal loading, pretreatment of catalysts, oxidant pressure, reaction temperature, and substrate concentration were investigated. Quantitative yield of acetic acid was obtained with 1.2 wt % Ru(OH)(x)/CeO2 under optimized conditions (150 degrees C, 10 bar O-2, 12 h of reaction time, 0.23 mol % Ru to substrate).
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