J. Iran. Chem. Soc., Vol. 8, Supp. 1 February 2011, pp.S44~S54.

Current location: JICS Archive > Vol. 8 > Supplement. 1 > Articles : 6

Synthesis and Characterization of Polycrystalline ZnO/HZSM-5 Nanocomposites

M. Khatamian*, Z. Alaji and A.A. Khandar

Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

     Polycrystalline ZnO/HZSM-5 nanocomposites were synthesized by the impregnation method using a home prepared HZSM-5 zeolite as porous support and Zn(C5H7O2)2 or Zn(NO3)2 as zinc precursors. As-prepared samples were characterized by ICP, XRD, SEM (EDS), TEM (SAED), BET and DRS techniques. A small amount of sub-nanometeric ZnO clusters were introduced into the channels of HZSM-5 zeolite. These ZnO clusters exhibited absorption band onset at about 280 nm, different from ZnO particles at about 370 nm. The significant blue shift possesses high quantum size effect in sub-nanometeric ZnO clusters. SAED and TEM images revealed that the ZnO nanoparticles, supported on the surface of HZSM-5 zeolite, were identified as polycrystalline structure with the particle size of about 20-25 nm. XRD results provided evidence of the strong host-guest interactions between HZSM-5 framework and ZnO structure. The samples prepared by Zn(C5H7O2)2 were more porous and smaller than those prepared from the Zn(NO3)2. This was confirmed by SEM and XRD results.

Keywords: HZSM-5 zeolite, ZnO, Zinc acetyl acetonate [Zn(C5H7O2)2], Nanocomposites, Quantum size effect

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