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

被引：139

作者：

Garcia-Basabe, Yunier ^{[1
,2
]}

Rodriguez-Iznaga, Inocente ^{[3
]}

de Menorval, Louis-Charles ^{[4
]}

Llewellyn, Philip ^{[5
]}

Maurin, Guillaume ^{[4
]}

Lewis, Dewi W. ^{[6
]}

Binions, Russell ^{[6
]}

Autie, Miguel ^{[7
]}

Rabdel Ruiz-Salvador, A. ^{[1
]}

机构：

[1] Univ Havana, Zeolite Engn Lab, Inst Mat Res & Engn, Havana 10400, Cuba

[2] Univ Matanzas, Fac Mech & Chem Engn, Dept Phys, Matanzas 40100, Cuba

[3] Univ Havana, Inst Mat Res & Engn, Mat Technol Lab, Havana 10400, Cuba

[4] Univ Montpellier 2, CNRS, Inst Charles Gerhardt Montpellier, F-34095 Montpellier 05, France

[5] Univ Provence, Ctr St Jerome, Lab Madirel UMR CNRS 6121, F-13397 Marseille 20, France

[6] Univ London Univ Coll, Dept Chem, London WC1H 0AJ, England

[7] Univ Havana, Mol Engn Lab, Inst Mat Res & Engn, Havana 10400, Cuba

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2010年 / 135卷 / 1-3期

关键词：

Clinoptilolite; Heulandite; Dealumination; Al vacancy; Silanol nest; EXTRA-FRAMEWORK ALUMINUM; LOW-SILICA ZEOLITES; CRYSTAL X-RAY; EXTRAFRAMEWORK IRON; FE-SILICALITE; AL-27; MAS; STATE; ACID; BETA; DEHYDRATION;

D O I：

10.1016/j.micromeso.2010.07.008

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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.

引用

页码：187 / 196

页数：10

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