Gas-phase Dehydration of Glycerol over Supported Silicotungstic Acids Catalysts
- Gas-phase Dehydration of Glycerol over Supported Silicotungstic Acids Catalysts
- 김용태; 정광덕; 박은덕
- Glycerol; Dehydration; biomass; Acrolein; Silicotungstic acids; Acidity
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 31, NO 11, 3283-3290
- 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.
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