Xenon-129 NMR study of the microporous structure of clays and pillared clays

摘要

(sup 129)Xe NMR studies have been carried out using xenon gas adsorbed in clays and pillared clays. Data from the measurements provide information on the pore structure of clays before and after pillaring. The results indicate that the effective pore diameter of montmorillonite increases, for example, from 5.4 (Angstrom) to 8.0 (Angstrom) after pillaring cheto-montmorillonite with aluminum polyoxohydroxy Keggin cations. The data are consistent with X-ray powder diffraction results, which show a corresponding increase in the interlamellar gallery height from 5.6 (Angstrom) to 8.4 (Angstrom).