Zeolites prepared from calcined and mechanically modified kaolins A comparative study

被引：93

作者：

San Cristobal, A. G. ^{[1
]}

Castello, R. ^{[1
]}

Martin Luengo, M. A. ^{[2
]}

Vizcayno, C. ^{[3
]}

机构：

[1] CSIC, Inst Ciencias Agr, E-28006 Madrid, Spain

[2] CSIC, Inst Ciencias Mat, E-28049 Madrid, Spain

[3] CSIC, Inst Recursos Nat, E-28006 Madrid, Spain

来源：

APPLIED CLAY SCIENCE | 2010年 / 49卷 / 03期

关键词：

Kaolin; Zeolite; Electron microscopy; X-ray diffraction; MECHANOCHEMICAL TREATMENT; AL-27; SI-29; TRANSFORMATION; ACTIVATION; SILICA;

D O I：

10.1016/j.clay.2010.05.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Kaoliniferous sand and washed industrial kaolin obtained from it were calcined (750 degrees C) or milling prior to activation with NaOH. The changes were characterized by pH, cation exchange capacity (CEC), water capacity after calcination (WCC), particle size distribution (PSD) and specific surface area (S-BET), as well as by X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermal methods (TGA and DTA), and scanning and transmission electron microscopy (SEM and TEM). Alkali activation of thermally or mechanically modified kaolin increased the cation exchange capacity from 2.4 to 292.8 and from 3.0 to 279.9 cmol kg(-1) (samples WT and WM respectively). Alkali activation of mechanically modified kaoliniferous sand (OMA), and thermally and mechanically modified washed kaolin (WTA and WMA), yielded zeolite A. An unnamed zeolite, forming microspheres of 0.8-2.3 mu m in size, was also formed in mechanically modified kaoliniferous sand (OMA), washed kaolin (WA) and calcined washed kaolin (WTA) after alkali-activation. Structural disorder in the mechanically modified washed kaolin (WMA) favored the formation of a single type of zeolite. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：239 / 246

页数：8

共 33 条

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