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The mechanism of layer charge reduction and regeneration in Li+-exchanged montmorillonite (1991)

Williams, J. ; Purnell, J. H. ; Ballantine, J. A.

Springer

Catalysis letters 9 (1991), S. 115-119

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ISSN: 1572-879X

Keywords: Clays ; montmorillonites ; charge reduction ; charge regeneration ; lithiation

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Thermally induced migration of Li+-cations from the interlamellar region into the sheet structure of montmorillonite clays has long been known to lead to charge reduction which, depending on conditions, may be partial or virtually complete. Charge regeneration by treatment with strong base involves H+-extraction from the sheets and detailed structural and interlamellar analysis establishes a 1∶1 balance between Li+ and H+ arising from the structural exchange -OH + Li+→-OLi + H+. Such lithiated clays are substantially more thermally and solvent stable than their precursors.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00769089

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