Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Toluene Decompositions over Al-W-incorporated Mesoporous Titanosilicates Photocatalysts

  • Lee, Ye-Ji (Department of Chemistry, College of Science, Yeungnam University) ;
  • Kim, Young-Mi (Department of Chemistry, College of Science, Yeungnam University) ;
  • Jeong, Ha-Rim (Department of Chemistry, College of Science, Yeungnam University) ;
  • Yeo, Min-Kyeong (Department of Environmental Science and Engineering, KyungHee University) ;
  • Kang, Mi-Sook (Department of Chemistry, College of Science, Yeungnam University)
  • Published : 2009.01.20
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Abstract

This study investigated the decomposition activities of toluene on 10 mol% Al-W-incorporated mesoporous titano (15 mol %) silicates. The mesopore sizes observed in the transmission electron microscopy images ranged from 2.0 to 5.0 nm, and the pores were irregular on the addition of 10 mol% Al or W ions, but changed to regular hexagonal forms with the simultaneous additions of Al and W. The X-ray photon spectroscopy results showed a shift of the special peak for Ti2p in Al-incorporated mesoporous titanosilicates to a stronger binding energy compared to those of mesoporous titanosilicates and Al-incorporated mesoporous titanosilicates. Three O1s peaks in the spectra of the Al and W coexisted samples were observed at 530.5 and 531.7, 533, and 533.7eV, which were assigned to $Ti-Os\;in\;TiO_2\;and\;Ti_2O_3,\;Si-O\;in\;SiO_2\;and\;Al-O\;in\;Al_2O_3$, respectively. The toluene molecules desorbed at lower temperatures over W-incorporated mesoporous titanosilicates, and the amounts of toluene desorbed were also small; however, Al-incorporated mesoporous titanosilicates adsorbed much more toluene, particular over $Al_7.5-W_2.5-Ti_15-Si_75$. The photocatalytic decomposition of toluene was more enhanced over $Al_7.5-W_2.5-Ti_15-Si_75$ than over Al- or W-incorporated mesoporous titanosilicates only.

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