Acidity and catalytic activity of mildly acid-treated Mg-rich montmorillonite and hectorite

KOMADEL, P., JANEK, M., MADEJOVA, J., WEEKES, A. and BREEN, C. (1997). Acidity and catalytic activity of mildly acid-treated Mg-rich montmorillonite and hectorite. Journal of the Chemical Society - Faraday Transactions, 93 (23), 4207-4210.

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    XRD, FTIR spectroscopy, cyclohexylamine desorption, potentiometric titrations and catalytic activity in an ether-forming test reaction have been used to investigate mildly acid-treated montmorillonite (SAz-1) and hectorite. The number of acid sites obtained from the cyclohexylamine desorption agreed with the accepted cation exchange capacity values for all samples. No evidence of any free protons was found in the potentiometric titration curves, which proved that complete autotransformation of the acid-treated samples had occurred over a much shorter period than previously recorded. Acid sites associated with Al3+ (Fe3+) released from the SAz-1 structure during acid treatment and subsequent autotransformation were of sufficient strength to cataryse the test reaction and produce tetrahydropyrstnyl ether in 80% yield. The complete absence of catalytic activity in the acid-treated hectorite samples confirmed that acid sites associated with interlayer Mg2+ and Li+ were unable to catalyse the test reaction.

    Item Type: Article
    Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
    Identification Number:
    Page Range: 4207-4210
    Depositing User: Jill Hazard
    Date Deposited: 14 May 2010 11:20
    Last Modified: 13 Jun 2017 12:46

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