Catalysis Letters

, Volume 18, Issue 1–2, pp 137–140 | Cite as

Synthesis and characterisation of alumina pillared Texas montmorillonite and determination of the effective Keggin ion charge

  • J. R. Jones
  • J. H. Purnell


Controlled calcination of Texas montmorillonite has allowed production of a range of materials of cation exchange capacity from ≈ 70 mequiv./100 g dry clay to virtually zero. Pillaring of these with Chlorhydrol precursor solution has then provided a family of materials of pillar density ranging from about one per six unit cells to zero. The analytical technique based on isomorphous metal dilution (IMD) that follows pillaring is validated. The results provide a consistent value for the precursor (Keggin) ion charge, in the conditions normally used, of 3.15±0.10 rather than the “formal” value of 7. An approach to the attainment of pillar densities consistent with the introduction of shape/size selectivity on pillared layered materials is outlined.


Montmorillonites layered materials pillared layered materials synthesis pillar precursor charge pillar density 


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  1. [1]
    J.H. Purnell, Catal. Lett. 5 (1990) 203.Google Scholar
  2. [2]
    J.H. Purnell, Catal. Lett. 14 (1992) 11.Google Scholar
  3. [3]
    J.H. Purnell and Lu Yun, Catal. Lett., submitted.Google Scholar
  4. [4]
    J.H. Purnell, J. Williams and Lu. Yun, Catal. Lett. 10 (1992) 63.Google Scholar
  5. [5]
    J.H. Purnell, in:Pillared Layered Structures: Current Trends and Application, ed. I.V. Mitchell (Elsevier, Amsterdam, 1990) p. 107.Google Scholar

Copyright information

© J.C. Baltzer AG, Science Publishers 1993

Authors and Affiliations

  • J. R. Jones
    • 1
  • J. H. Purnell
    • 1
  1. 1.Department of ChemistryUniversity College of SwanseaSingleton ParkUK

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