Selective gas adsorption by metal exchanged amorphous kaolinite derivatives

被引：39

作者：

Melnitchenko, A

Thompson, JG

Volzone, C

Ortiga, J

机构：

[1] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia

[2] CONICET, CETMIC, RA-1033 Buenos Aires, DF, Argentina

来源：

APPLIED CLAY SCIENCE | 2000年 / 17卷 / 1-2期

关键词：

amorphous materials; cation exchange; adsorption; separation; kaolinite; specific surface;

D O I：

10.1016/S0169-1317(00)00003-X

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：

Metal exchanged amorphous kaolinite derivates are studied for their gas adsorption properties. The kaolinite derivatives were prepared by aqueous reaction of the clay with concentrated KF solution at 80-110 degrees C. The K+ ions were then exchanged by Cs+, Sr2+, La3+, Fe3+ or Cu2+. Fe(II)- and Cu(I)-containing derivatives were prepared by reduction under H-2. The gases tested were N-2, O-2, CH4, CO, CO2, and C2H2. Correlations between gas retention and various physical and chemical variables are investigated. Gas retention levels normalised against BET surface show that level of adsorption is at least partly determined by surface chemical composition. The highest gas retention levels per unit area are achieved for alkali metal exchanged derivatives or alternately for exchange cations with the largest ionic radius. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：35 / 53

页数：19

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