Garcia-Basabe, Y and Rodriguez-Iznaga, I and de Menorval, LC and Llewellyn, P and Maurin, G and Lewis, DW and Binions, R and Autie, M and Ruiz-Salvador, AR (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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