Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars

M. L. Occelli and R. M. Tindwa
Gulf Research & Development Company, P.O. Drawer 2038, Pittsburgh, Pennsylvania 15230

Abstract: By ion exchanging expandable clay minerals with large, cationic oxyaluminum polymers, “pillars” were introduced that permanently prop open the clay layers. On the basis of thermal, infrared spectroscopic, adsorption, and X-ray powder diffraction (XRD) analysis, the interlayering of commercial sodium bentonite with aluminum chlorohydroxide, [Al13O4(OH)24(H2O)12]+7, polymers appears to have produced an expanded clay with a surface area of 200–300 m2/g. The pillared product contained both Brönsted and Lewis acid sites. XRD and differential scanning calorimetry measurements indicated that the micropore structure of this interlayered clay is stable to 540°C. Between 540° and 760°C, the pillared day collapsed with a corresponding decrease in surface area (to 55 m2/g) and catalytic cracking activity for a Kuwait gas oil having a 260°–476°C boiling range.

Key Words: Catalysis • Interlayering • Molecular sieve • Montmorillonite • Oxyaluminum • Pillar

Clays and Clay Minerals; February 1983 v. 31; no. 1; p. 22-28; DOI: 10.1346/CCMN.1983.0310104
© 1983, The Clay Minerals Society
Clay Minerals Society (www.clays.org)