Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Al Content on the Gas-Phase Dehydration of Glycerol over Silica-Alumina-Supported Silicotungstic Acid Catalysts

  • Kim, Yong-Tae (Division of Energy Systems Research and Department of Chemical Engineering, Ajou University) ;
  • You, Su-Jin (Division of Energy Systems Research and Department of Chemical Engineering, Ajou University) ;
  • Jung, Kwang-Deog (Clean Energy Research Center, Korea Institute of Science and Technology) ;
  • Park, Eun-Duck (Division of Energy Systems Research and Department of Chemical Engineering, Ajou University)
  • Received : 2012.02.24
  • Accepted : 2012.04.22
  • Published : 2012.07.20
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Abstract

The gas-phase dehydration of glycerol to acrolein was carried out over silicotungstic acid ($H_4SiW_{12}O_{40}{\cdot}xH_2O$, HSiW) catalysts supported on $SiO_2$, ${\eta}-Al_2O_3$, 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 $315^{\circ}C$ than did $SiO_2$- and ${\eta}-Al_2O_3$-supported HSiW catalysts. Among the tested catalysts, HSiW/$Si_{0.9}Al_{0.1}O_x$ 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 $500^{\circ}C$. 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.

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