Abstract
The integrated immersion heats of naturally oxidized powdered iron in water and organic liquids (n-octylamine, n-octanol, and n-undecane) and the adsorption heats of the vapors of water, octylamine, cyclohexylamine, and a mixture of primary aliphatic amines with C9–C13 alkyl radicals were measured by calorimetry. The interaction energy of powdered iron with octylamine was found to be higher than with normal hydrocarbons (C10) or alcohols (C8) and at least two times that with water, because a specific (donor-acceptor) interaction of an adsorbent with amino group is stronger than with OH group of water and alcohols. The surface properties of powdered iron were compared with those of hydroxylated silica gel and carbon.
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