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Clays and Clay Minerals

, Volume 27, Issue 3, pp 201–208 | Cite as

Synthesis and Properties of Heat-Stable Expanded Smectite and Vermiculite

  • R. H. LeoppertJr.
  • M. M. Mortland
  • T. J. Pinnavaia
Article

Abstract

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.

Key Words

Expanded Clays Heat-Stable Clays Hectorite Intercalation Intersalation Phenanthroline Smectite Vermiculite 

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

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

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.

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Copyright information

© The Clay Minerals Society 1979

Authors and Affiliations

  • R. H. LeoppertJr.
    • 1
  • M. M. Mortland
    • 1
  • T. J. Pinnavaia
    • 1
  1. 1.Departments of Crop and Soil Sciences and ChemistryMichigan State UniversityEast LansingUSA

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