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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 7
BKCSDE 33(7)
July 20, 2012 

Effect of Al Content on the Gas-Phase Dehydration of Glycerol over Silica-Alumina-Supported Silicotungstic Acid Catalysts
Yong Tae Kim, Su Jin You, Kwang-Deog Jung, Eun Duck Park*
Dehydration, Glycerol, Acrolein, Silica-alumina, Silicotungstic acid
The gas-phase dehydration of glycerol to acrolein was carried out over silicotungstic acid (H4SiW12O40·xH2O, HSiW) catalysts supported on SiO2, η-Al2O3, and silica-aluminas with different Al contents. The HSiW catalysts supported on silica-aluminas showed higher glycerol conversions and acrolein yields during the initial 2 h at 315 oC than did SiO2- and η-Al2O3-supported HSiW catalysts. Among the tested catalysts, HSiW/ Si0.9Al0.1Ox exhibited the highest space-time yield during the initial 2 h. The loaded HSiW species can change the acid types and suppress the formation of carbonaceous species on Al-rich silica-aluminas. The deactivated HSiW supported on silica-aluminas can be fully regenerated after calcination in air at 500 oC. As long as the molar ratio between water and glycerol was in the range of 2-11, the acrolein selectivity increased significantly with increasing water content in the feed, while the surface carbon content decreased owing to the suppression of heavy compounds.
2369 - 2377
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