Skip to main content
SpringerLink
Log in

Preparation and characterization of WO3/SiO2 catalysts

  • Published:
Catalysis Letters Aims and scope Submit manuscript

Abstract

Two sets of WO3/SiO2 catalysts were prepared from (NH4 6H2W12O40 (aqueous method) and W(η3-C3H5)4 (non-aqueous method). The molecular structures and dispersions of the surface tungsten oxide species for the WO3/SiO2 catalysts under ambient and in situ dehydrated conditions were investigated by Raman spectroscopy. The samples prepared from (NH4)6H2W12O40 (aqueous method) exhibit very strong Raman features due to the presence of crystalline WO3 and the samples prepared from W(η3-C3H5)4 (non-aqueous method) do not possess crystalline WO3. These results suggest that the preparation method exerts an influence on the dispersion of the surface tungsten oxide species on SiO2. The surface tungsten oxide species under ambient conditions possess polytungstate clusters, W12O 12−42 , on the silica support. Upon dehydration at elevated temperatures, the hydrated polytungstate clusters decompose and interact with the silica support via the formation of isolated, octahedrally coordinated tungsten oxide species.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. S.R. Stampfl, Y. Chen, J.A. Dumesic, C. Niu and C.G. Hill Jr., J. Catal. 105 (1987) 445.

    Google Scholar 

  2. R.D. Roark, S.D. Kohler, J.G. Ekerdt, D.S. Kim and I.E. Wachs, Catal. Lett. 16 (1992) 77.

    Google Scholar 

  3. Y. Iwasawa, in:Advances in Catalysis, Vol. 35 (Academic Press, New York, 1987) p. 265.

    Google Scholar 

  4. Y.I. Yermakov, Catal. Rev. Sci. Eng. 13 (1976) 77.

    Google Scholar 

  5. J.P. Candlin and H. Thomas, Adv. Chem. Ser. 132 (1974) 212.

    Google Scholar 

  6. L. Rodrigo, K. Marcinkowska, A. Adnot, P.C. Roberge, S. Kaliaguine, J.M. Stencil, L.E. Makovsky and J.R. Diehl, J. Phys. Chem. 90 (1986) 2690.

    Google Scholar 

  7. C.C. Williams, J.G. Ekerdt, J.M. Jehng, F.D. Hardcastle, A.M. Turek and I.E. Wachs, J. Phys. Chem. 95 (1991) 8781.

    Google Scholar 

  8. C.C. Williams and J.G. Eckerdt, J. Catal. 141 (1993) 430.

    Google Scholar 

  9. N. Spencer, J. Catal. 109 (1988) 187.

    Google Scholar 

  10. D.S. Kim and I.E. Wachs, J. Catal. 141 (1993) 419.

    Google Scholar 

  11. F.D. Hardcastle and I.E. Wachs, J. Mol. Catal. 46 (1988) 173.

    Google Scholar 

  12. S.S. Chan, I.E. Wachs and L.L. Murrell, J. Catal. 90 (1984) 150.

    Google Scholar 

  13. W.P. Griffith and P.J.B.J. Lesniak, J. Chem. Soc. A (1969) 1066.

  14. C.F. Baes and R.E. Mesmer, in:Hydrolysis of Cations (Wiley, New York, 1986).

    Google Scholar 

  15. G. Deo and I.E. Wachs, J.Phys. Chem. 95 (1991) 5889.

    Google Scholar 

  16. D.S. Kim and I.E. Wachs, J. Catal. 136 (1992) 539.

    Google Scholar 

  17. S.D. Kohler, J.G. Ekerdt, D.S. Kim and I.E. Wachs, Catal. Lett. 16 (1992) 231.

    Google Scholar 

  18. G.A. Parks, Chem. Rev. 65 (1965) 177.

    Google Scholar 

  19. F.D. Hardcastle, PhD Thesis, Lehigh University, USA (1990); F.D. Hardcastle and I.E. Wachs, J. Raman Spectry., in press.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Zettlemoyer Center for Surface Studies, Department of Chemical Engineering, Lehigh University, 18015, Bethlehem, PA, USA

    Du Soung Kim, Marlene Ostromecki & Israel E. Wachs

  2. Department of Chemical Engineering, University of Texas at Austin, 78721, Austin, TX, USA

    Steve D. Kohler & John G. Ekerdt

Authors
  1. Du Soung Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Marlene Ostromecki
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Israel E. Wachs
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Steve D. Kohler
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. John G. Ekerdt
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Kim, D.S., Ostromecki, M., Wachs, I.E. et al. Preparation and characterization of WO3/SiO2 catalysts. Catal Lett 33, 209–215 (1995). https://doi.org/10.1007/BF00814225

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00814225

Keywords

Search

Navigation