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Catalysis Letters

, Volume 10, Issue 1–2, pp 63–69 | Cite as

Charge reduction and regeneration in K+, Na+, Mg2+, Ni2+ and Co2+-exchanged Wyoming Bentonite

  • J. H. Purnell
  • J. Williams
  • Lu Yun
Article

Abstract

Controlled calcination of ion-exchanged Wyoming Bentonite in the presence and absence of ammonia leads to layer charge reductions. Detailed chemical analyses of both unexchangeable and exchangeable species lead to the conclusion that in no case is there migration of the original interlamellar cations into the octahedral region of the layers although, in terms of ionic radius alone, Mg2+, Ni2+ and, possibly Co2+, might be expected to do so. The production of unexchangeable Mg, Ni or Co, is identified as resulting from high temperature hydrolysis leading to hydroxide or oxide formation.

Keywords

Montmorillonite Bentonite, clay charge reduction/regeneration cation migration 

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1991

Authors and Affiliations

  • J. H. Purnell
    • 1
  • J. Williams
    • 1
  • Lu Yun
    • 1
  1. 1.Department of ChemistryUniversity College of SwanseaSingleton ParkUK

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