Clays and Clay Minerals, Vol. 54, No. 3, 375-381, 2006.
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Authors
Noyan, Hulya
Onal, Muserref
Sarikaya, Yuksel
Issue Date
2006
Type
Article
Language
en_US
Keywords
Periodicals , Geology , Acid Strength , Bentonite , Heating , Surface Acidity , Surface Area
Alternative Title
The Effect of Heating on the Surface Area, Porosity and Surface Acidity of a Bentonite
Abstract
The Hancili bentonite from Turkey shows significant changes in surface area, micro- and mesoporosity, surface acidity and acid strength with heating from 100 to 900C for 2 h. The specific surface area (S) and specific micro-mesopore volume (V) of the original and heated samples were evaluated from N2 adsorption and desorption data, respectively, by standard methods. The adsorption of n-butylamine from the solution in cyclohexane on the samples was used to determine the total surface acidity (nm) and the adsorption equilibrium constant (K) was taken as a measure of the acid strength. S, V and nm having initial values of 98 m2g-1, 0.080 cm3g-1 and 4.8610-4 mol g-1, respectively, stayed approximately constant as the temperature increased to 450C and then decreased almost in parallel with each other, reaching their minimum or zero at 900C. The total surface acidity, in general, declines with increasing temperature. The most acidic sites, however, increase with heating, and especially at dehydration and dehydroxylation. Acid strength reaches its maximum during the dehydroxylation phase at ~600C. It was concluded that the total surface acidity does not necessarily parallel the strength of the most acid sites.
Description
gsccm-54-3-08-noy.pdf 516KB PDF/A Document.
Citation
Clays and Clay Minerals, Vol. 54, No. 3, 375-381, 2006.
Publisher
The Clay Minerals Society
License
Copyright © 2006-2018.