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Step-wise dealumination of natural clinoptilolite: Structural and physicochemical characterization

Garcia-Basabe, Y; Rodriguez-Iznaga, I; de Menorval, LC; Llewellyn, P; Maurin, G; Lewis, DW; ... Ruiz-Salvador, AR; + view all (2010) Step-wise dealumination of natural clinoptilolite: Structural and physicochemical characterization. MICROPOR MESOPOR MAT , 135 (1-3) 187 - 196. 10.1016/j.micromeso.2010.07.008.

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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.

Type:Article
Title:Step-wise dealumination of natural clinoptilolite: Structural and physicochemical characterization
DOI:10.1016/j.micromeso.2010.07.008
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
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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