Selective gas adsorption by amorphous clay-mineral derivatives

Abstract Amorphous derivates prepared by aqueous reaction of various aluminosilicate clay minerals with concentrated KF solution at 80–110°C were studied for their gas adsorption properties. The four clay minerals studied are halloysite, a well-crystallized kaolinite, a poorly crystallized kaolinite...

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Bibliographic Details
Published in:Clays and clay minerals 1999-10, Vol.47 (5), p.647-657
Main Authors: VOLZONE, C, THOMPSON, J. G, MELNITCHENKO, A, ORTIGA, J, PALETHORPE, S. R
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Mineralogy
Silicates
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Summary:Abstract Amorphous derivates prepared by aqueous reaction of various aluminosilicate clay minerals with concentrated KF solution at 80–110°C were studied for their gas adsorption properties. The four clay minerals studied are halloysite, a well-crystallized kaolinite, a poorly crystallized kaolinite, and a montmorillonite. The gases tested are N 2 , O 2 , CH 4 , CO, CO 2 , and C 2 H 2 . The kaolin-group mineral derivatives are characterized by substantial reduction in particle size, high specific surface, and significant selectivity towards CO 2 and C 2 H 2 relative to the other gases. The montmorillonite derivative shows no increase in adsorption over the starting material, however, for all the materials high adsorption of CO 2 and C 2 H 2 was observed. Levels of gas adsorption and gas adsorption ratios are comparable to pillared clays.
ISSN:0009-8604
1552-8367
DOI:10.1346/ccmn.1999.0470511