Skip to main content
SpringerLink
Log in

Identification of Cr oxidation state active in ethylene polymerization on Cr/SiO2 at room temperature

  • Published:
Catalysis Letters Aims and scope Submit manuscript

Abstract

High temperature treatment under vacuum or in a pure N2 atmosphere can be used instead of a reduction step to activate Cr/SiO2 catalysts used for ethylene polymerization. After this procedure, the Cr species active over a range of temperature has been identified as Cr(III) using CO adsorption (IR triplet bands at 2228, 2214, and 2202 cm−1) and an ethylene polymerization activation energy of 12.1 kcal/mol. The Cr(III) species has also been shown to be present after activation using CO reduction, the more commonly used procedure. Cr(II) sites are always present when activation involves reduction with CO and become increasingly active as the temperature rises above room temperature.

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. M.P. McDaniel,The State of Cr on the Phillips Polymerization Catalyst, 11th Midland Macromolecular Meeting, August 17–21, 1981, Midland, MI, USA.

  2. B. Rebenstorf and R. Larsson, J. Catal. 84 (1983) 240.

    Google Scholar 

  3. B. Rebenstorf, Z. anorg. allg. Chem. 513 (1984) 103.

    Google Scholar 

  4. D.L. Myers and J.H. Lunsford, J. Catal. 92 (1985) 260.

    Google Scholar 

  5. D.L. Myers and J.H. Lunsford, J. Catal. 99 (1986) 140.

    Google Scholar 

  6. J.H. Lunsford, S.-L. Fu and D.L. Myers, J. Catal. 111 (1988) 231.

    Google Scholar 

  7. M.P. McDaniel, Adv. Catal. 33 (1985) 47.

    Google Scholar 

  8. P. Zielinski, J. Szymura and I.G. Dalla Lana,An Alternative Means for the Activation of Cr/SiO 2 Polyethylene Polymerization Catalyst, The 65th Annual Colloid and Surface Science Symposium, Norman, Oklahoma, June 17–19, 1991.

  9. W.K. Jozwiak and I.G. Dalla Lana, submitted for publication.

  10. B. Rebenstorf, Z. anorg. allg. Chem. 571 (1989) 148.

    Google Scholar 

  11. G. Ghiotti, E. Garrone and A. Zecchina, J. Mol. Catal. 46 (1988) 61.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Chemical Engineering, University of Alberta, T6G 2G6, Edmonton, Alberta, Canada

    P. A. Zielinski, J. A. Szymura & I. G. Dalla Lana

  2. Technical University of Lodz, Lodz, Poland

    P. A. Zielinski

  3. Technical and Agricultural University, Bydgoszcz, Poland

    J. A. Szymura

Authors
  1. P. A. Zielinski
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. J. A. Szymura
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. I. G. Dalla Lana
    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

Zielinski, P.A., Szymura, J.A. & Dalla Lana, I.G. Identification of Cr oxidation state active in ethylene polymerization on Cr/SiO2 at room temperature. Catal Lett 13, 331–339 (1992). https://doi.org/10.1007/BF00765035

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00765035

Keywords

Search

Navigation