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Publication Detail
Step-wise dealumination of natural clinoptilolite: Structural and physicochemical characterization
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Garcia-Basabe Y, Rodriguez-Iznaga I, de Menorval LC, Llewellyn P, Maurin G, Lewis DW, Binions R, Autie M, Ruiz-Salvador AR
  • Publisher:
    ELSEVIER SCIENCE BV
  • Publication date:
    11/2010
  • Pagination:
    187, 196
  • Journal:
    MICROPOR MESOPOR MAT
  • Volume:
    135
  • Issue:
    1-3
  • Print ISSN:
    1387-1811
  • Language:
    EN
  • Keywords:
    Clinoptilolite, Heulandite, Dealumination, Al vacancy, Silanol nest, EXTRA-FRAMEWORK ALUMINUM, EQUALIZATION METHOD EEM, LOW-SILICA ZEOLITES, CRYSTAL X-RAY, NMR-SPECTROSCOPY, MAS-NMR, COMPUTER-SIMULATION, EXTRAFRAMEWORK IRON, FE-SILICALITE, AL-27 MAS
  • Addresses:
    Ruiz-Salvador, AR
    Univ Havana
    Zeolite Engn Lab
    Inst Mat Res & Engn
    Havana
    10400
    Cuba

    Univ Matanzas
    Fac Mech & Chem Engn
    Dept Phys
    Matanzas
    40100
    Cuba
Abstract
The step-wise dealumination of a natural clinoptilolite has been achieved through a new milder treatment, comprising cycles of aqueous solutions of hydrochloric acid with washing steps. The course of the dealumination was monitored by XRD, FTIR, TGA, UV-vis-DRS and NMR. The XRD patterns show a contraction of cell volume during progressive dealumination steps and a decrease in crystallinity after the third dealumination cycle. The framework and OH vibrations in FTIR spectra show progressive extraction of aluminum atoms from zeolite framework and consequently the formation of silanol nests. Al-27 MAS NMR indicates that low levels of octahedral aluminum species are created during the treatments. (C) 2010 Elsevier Inc. All rights reserved.
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