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Volume 27 - December 1992

Contents

Page 3 of 4

Notes

Research Article

  • Stereoselectivity of montmorillonite in the adsorption and deamination of some amino acids

  • B. Siffert, A. Naidja
  • Published online by Cambridge University Press:
    09 July 2018, pp. 109-118

  • Optical isomers deamination of L- and D-glutamic and aspartic amino acids and of their DL racemic mixtures has been achieved in the presence of Na-montmorillonite at pH = 6 and room temperature. The adsorption curves showed that the enantiomer adsorbed depends on the type of amino acid. Nevertheless, deamination reaction kinetics brought about a stereoselectivity of the clay mineral for the L-isomer and implicitly showed an unquestionable “structural chirality character” of the clay mineral.

  • Synthesis of zeolites from thermally activated kaolinite. Some observations on nucleation and growth

  • M. Murat, A. Amokrane, J. P. Bastide, L. Montanaro
  • Published online by Cambridge University Press:
    09 July 2018, pp. 119-130

  • Depending on the preparation temperature and the origin of the raw mineral, the products obtained by thermal activation of kaolinite lead, by hydrothermal treatment with sodium hydroxide at 102°C, either to zeolite 4A, or to cubic zeolite P, or to a mixture of cubic and tetragonal zeolite P. The change in the type of zeolite obtained was explained on the basis of a radical change of the zeolite nucleation process due to either the presence of soluble potassium or high silica content resulting from dehydration of muscovite (an impurity in the raw-kaolinite), or from “segregation” associated with the first step of the metakaolinite to mullite transformation. These phenomena occur at a lower calcination temperature with poorly-crystallized kaolinite, and iron in such a sample promotes a sensitive decrease in the formation rate of zeolite crystals. Such results could be used to characterize the crystallinity of kaolinites.

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Front matter

  • CLM volume 27 issue 2 Cover and Front matter

  • Published online by Cambridge University Press:
    09 July 2018, p. f1
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