Ld. Taranukhina et al., QUANTITATIVE INFRARED-SPECTROSCOPIC STUDY OF APROTIC ACIDITY OF THE SURFACE OF NATURAL ALUMINOSILICATES, Journal of applied chemistry of the USSR, 65(6), 1992, pp. 1067-1071
Infrared spectroscopy has been used in a study of the adsorption of be
nzonitrile on the surface of a cation-exchange form of kaolinite. The
integral absorption coefficients of the stretching vibration bands of
benzonitrile both adsorbed in the molecular form and bonded with the e
xchange cations were calculated. From these IR spectra, the relative c
oncentration of the aprotic acid centers on the surface of the kaolini
te was determined. From these studies it was possible to obtain quanti
tative characteristics of the acidic properties of the kaolinite surfa
ce and to establish their dependence on the nature of the exchange cat
ions and the temperature of the preliminary vacuum heat-treatment of t
he samples.