Formation of Organic Derivatives of Boehmite by the Reaction of Gibbsite with Glycols and Aminoalcohols

Inoue Masashi, Tanino Hirokazu, Kondo Yasuhiko and Inui Tomoyuki
Department of Hydrocarbon Chemistry, Faculty of Engineering Kyoto University, Yoshida, Kyoto 606, Japan

Abstract: The reaction of gibbsite in various organic solvents at 250°–300°C under spontaneous vapor pressure of the solvents was examined. Glycols and aminoalcohols afforded the organic derivatives of boehmite in which one of the oxygen atoms of the glycol molecule or the alcoholic oxygen atom of aminoalcohol was incorporated into the boehmite layers. By increasing the molecular size of the solvent, the yield of the boehmite derivative decreased, and, at the same time, the basal spacing of the boehmite derivative increased. The product had a honeycomb texture on the surface of the particle, which suggests a dissolution-recrystallization mechanism for the formation of the boehmite derivatives. A hydroxyl group and a functional group, such as hydroxyl, methoxyl, or amino group having the ability to donate its lone pair electrons, were apparently necessary for the organic solvent molecules to form the boehmite derivative by this mechanism.

Key Words: Amino alcohol • Boehmite • Gibbsite • Glycol • Infrared spectroscopy • Organic derivative • X-ray powder diffraction

Clays and Clay Minerals; April 1991 v. 39; no. 2; p. 151-157; DOI: 10.1346/CCMN.1991.0390206
© 1991, The Clay Minerals Society
Clay Minerals Society (www.clays.org)