Summary
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1.
Absolute adsorption isotherms have been obtained for n-butylamine and diethylamine vapor along with absorption from solutions in n-heptane on silica gel and aluminum oxide.
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2.
Either in the vapor form or from solutions in n-heptane, the amines are to a considerable extent irreversibly adsorbed on hydrated silica gel and aluminum oxide surfaces.
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3.
The amine molecules are more densely adsorbed from liquid solutions than from vapors, the area occupied by a molecule in the dense adsorbed layer being 20–25 A2 for adsorption from solutions, and 35–45 A2 for adsorption from vapors.
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Aktanova, S., Kiselev, A.V. & Él'tekov, U.A. Adsorption of aliphatic amines on aluminum oxide and silica. Russ Chem Bull 11, 1849–1856 (1962). https://doi.org/10.1007/BF00921337
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DOI: https://doi.org/10.1007/BF00921337