Preparation and Characterization of Silica-Alumina-Pillared Montmorillonites with High Surface Area

摘要

The silica-alumina-pillared montmorillonite materials (SiAl-MMT) were developed by a novel method, which combined several techniques such as ion-exchange, intercalation and surfactant modification. The morphology, composite structure and pore properties of such composite materials, were investigated by X-ray powder diffraction (XRD), Scanning Electronic Microscopy (SEM), Fourier-transform infra-red (FTIR) spectra, as well as Nitrogen Adsorption-Desorption Isotherms. The layer structure of the prepared materials retained and their pore structures were found to be slit-shaped pores located between plate-like particles. The prepared SiAl-MMT materials had a BJH pore volume of 0.63cm~3 g~(-1), a remarkably high BET specific surface area beyond 1000 m~2 g~(-1), and a narrow pore size distribution in the mesoporous region 3.5-4 nm after thermal treatment at 600℃.