Synthesis and Properties of Heat-Stable Expanded Smectite and Vermiculite1

R. H. Leoppert Jr., M. M. Mortland and T. J. Pinnavaia
Departments of Crop and Soil Sciences and Chemistry Michigan State University, East Lansing, Michigan 48824
1 Journal Article No. 8740. Michigan Agricultural Experiment Station. Work partially supported by National Science Foundation Grant No. CHE 76-80370.

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

Clays and Clay Minerals; June 1979 v. 27; no. 3; p. 201-208; DOI: 10.1346/CCMN.1979.0270305
© 1979, The Clay Minerals Society
Clay Minerals Society (www.clays.org)