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Synthesis and Properties of Heat-Stable Expanded Smectite and Vermiculite

Published online by Cambridge University Press:  01 July 2024

R. H. Leoppert Jr. ,
M. M. Mortland  and
T. J. Pinnavaia
R. H. Leoppert Jr.
Affiliation:
Departments of Crop and Soil Sciences and Chemistry, Michigan State University, East Lansing, Michigan 48824
M. M. Mortland
Affiliation:
Departments of Crop and Soil Sciences and Chemistry, Michigan State University, East Lansing, Michigan 48824
T. J. Pinnavaia
Affiliation:
Departments of Crop and Soil Sciences and Chemistry, Michigan State University, East Lansing, Michigan 48824
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Abstract

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When aqueous dispersions of Na+-smectite or n-butylammonium-vermiculite react with sulfate salts of Fe(II), Co(II), or Ni(II) bipyridyl or 1, 10-phenanthroline complexes in excess of the cation-exchange capacities, intersalated phases with spacings of about 29.5 Å are obtained. Thermal decomposition of the intersalated complex cations affords expanded phases with a d(001) spacing near 18 Å for the smectites and near 28 Å for the vermiculites. These phases are stable to temperatures of at least 550°C. Nitrogen surface areas of the fired products are as high as 400 m2/g.

Резюме

Резюме

Когда водные дисперсии Na+-смектита или n-бутил-аммониевого вермикулита реагируют с сульфатными солями Fe(II), Со(ІІ), или Ni(ІІ)-бипиридиловыми, или 1,10-фенантролиновыми комплексами сверх катионных обменных способностей, образуются межсолевые фазы с промежутками около 29,5 Å. В результате термальной декомпозиции катионов межсолевого комплекса образуются расширенные фазы с промежутками d (001) около 18 Å для смектитов и около 28 Å для вермикулитов. Эти фазы стабильны к температуре по крайней мере до 550°С. Азотные поверхностные площади прокаленных продуктов достигают 400 м2/г.

Resümee

Resümee

Wenn wäßrige Dispersionen von Na+-Smektit oder n-Butylammonium-Vermiculit mit Sulfaten von Fe(II), Co(II), oder Ni(II) bipyridyl oder 1,10-Phenanthroiinkompiexen über die Kationenaustauschkapazitäten hinaus reagieren, werden intersalierte Phasen mit Netzabständen von 29,5 Å erhalten. Thermischer Abbau der intersalierten komplexen Kationen ergibt ausgedehnte Phasen mit einem d(001) Abstand von fast 18 Å für die Smektiten und fast 28 Å für die Vermiculite. Diese Phasen sind bis auf Temperaturen von mindestens 550°C stabil. Stickstoff-Oberflächen der gefeuerten Produkte gehen bis auf 400 m2/g hinauf.

Résumé

Résumé

Lorsque des dispersions aqueuses de smectite-Na+ ou de n-butylammonium-vermiculite-réagissent avec des complexes de sels de sulfate de Fe(II), Co(II), ou Ni(II) bipyridyl ou de 1,10-phenanthroline en excès des capacités d’échange de cations, des phases intersalatées avec des espacements d'environ 29,5 Å sont obtenues. La décomposition thermale des cations du complexe intersalaté permet des phases dilatées avec un espacement d(001) près de 18 Å pour les smectites et près de 28 Å pour les vermiculites. Les phases sont stables jusqu’à des températures d'au moins 550°C. Les régions superficielles de nitrogène des produits calcinés sont aussi élevées que 400 m2/g.

Keywords

Expanded ClaysHeat-Stable ClaysHectoriteIntercalationIntersalationPhenanthrolineSmectiteVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 27 , Issue 3 , June 1979 , pp. 201 - 208
Copyright
Copyright © 1979, The Clay Minerals Society

Footnotes

1

Journal Article No. 8740. Michigan Agricultural Experiment Station. Work partially supported by National Science Foundation Grant No. CHE 76-80370.

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