Catalysis Letters

, Volume 16, Issue 1–2, pp 1–9 | Cite as

The retention of copper ions by AlPO4-5/VAPO-5 and their effect on reactant access

  • B. I. Whittington
  • J. R. Anderson


The reaction of copper salts with AlPO4-5 or Vv-VAPO-5 under acidic (CuCl2, pH adjusted to 2) but especially basic conditions (Cu(NH3) 4 2+ , pH adjusted to 9) gives ion incorporations greater than expected by a simple ion exchange mechanism (both AlPO4-5 and Vv-VAPO-5 could be expected to have no cation exchange capacity). Ion incorporation is proposed to occur initially at defect sites, and examination of the ESR spectrum of a dehydrated, evacuated CuCl2-exchanged AlPO4-5 shows that these defect sites give rise to a number of unique environments upon CuII incorporation. The CuCl2-exchanged VAPO-5 retains a significant toluene accessibility to the Vv sites in the VAPO-5. However, the toluene accessibility in the Cu(NH3) 4 2+ -exchanged VAPO-5 is significantly reduced and we propose this is due to a combination of the presence of crystalline CuO and structural collapse from reaction with base (NH4OH). The ability of treatment with base (NH4OH, pH ≈ 13) to restrict access of toluene to the Vv sites of the original VAPO-5 was verified in a separate experiment.


Ion exchange AlPO4-5 VAPO-5 defect sites copper ESR 


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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1992

Authors and Affiliations

  • B. I. Whittington
    • 1
    • 2
  • J. R. Anderson
    • 1
    • 2
  1. 1.Chemistry DepartmentMonash UniversityClaytonAustralia
  2. 2.CSIRO Division of Materials Science and TechnologyClaytonAustralia

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