Gas-phase dehydration of glycerol over Supported W/Zr Mixed Oxides
Date Issued
2010
Date
2010
Author(s)
Huang, Guo-Yang
Abstract
Zirconia loaded with tungsten oxide (abbreviated as WZ) has been reported to be an efficient catalyst in dehydration of glycerol to form acrolein. In the present study, mesoporous SBA-15, which has very high surface area and a uniform hexagonal array of channel-shaped mesopores, was used as the support for preparing supported WZ catalyst (abbreviated as WZ/SBA-15) in order to increase the surface area of tungstated zirconia. Different methods for preparing the supported catalysts were compared. The catalysts prepared through supercritical ethanol were found to retain well ordered porous structure based on small angle X-ray diffraction. The acidities were examined by NH3-TPD and FT-IR, The gas-phase dehydration of glycerol in the presence of water was investigated at temperatures around 290 oC. Factors of catalyst preparation such as the weight ratios of tungsten and zirconium to SBA-15, the calcination temperature of the catalysts, and various silica supports in influencing the catalytic performances were examined.
Subjects
WO3
ZrO2
dehydration
glycerol
acrolein
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