Gas-phase Dehydration of Glycerol over Supported Silicotungstic Acids Catalysts

Title
Gas-phase Dehydration of Glycerol over Supported Silicotungstic Acids Catalysts
Authors
김용태정광덕박은덕
Keywords
Glycerol; Dehydration; biomass; Acrolein; Silicotungstic acids; Acidity
Issue Date
2010-11
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 31, NO 11, 3283-3290
Abstract
The gas-phase dehydration of glycerol to acrolein was carried out over 10 wt % HSiW catalysts supported on different supports, viz. γ-Al2O3, SiO2-Al2O3, TiO2, ZrO2, SiO2, AC, CeO2 and MgO. The same reaction was also conducted over each support without HSiW for comparison. Several characterization techniques, N2-physisorption, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the temperature-programmed desorption of ammonia (NH3- TPD), temperature-programmed oxidation (TPO) with mass spectroscopy and CHNS analysis were employed to characterize the catalysts. The glycerol conversion generally increased with increasing amount of acid sites. Ceria showed the highest 1-hydroxyacetone selectivity at 315 ℃ among the various metal oxides. The supported HSiW catalyst showed superior catalytic activity to that of the corresponding support. Among the supported HSiW catalysts, HSiW/ZrO2 and HSiW/SiO2-Al2O3 showed the highest acrolein selectivity. In the case of HSiW/ZrO2, the initial catalytic activity was recovered after the removal of the accumulated carbon species at 550 ℃ in the presence of oxygen.
URI
http://pubs.kist.re.kr/handle/201004/38887
ISSN
0253-2964
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KIST Publication > Article
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