Adsorption of methylamines on carbon materials at zero surface coverage

This paper deals with the adsorption of mono-, di- and trimethylamine (MMA, DMA and TMA) on carbon materials at zero surface coverage studied by inver se gas-solid chromatography (IGSC). The adsorbents have different textural characteristics and chemical surface groups, as revealed by N-2 and CO2 ads orption, mercury porosimetry, FTIR spectroscopy and selective tritrations. These properties are related to the type of interactions of the adsorbates. MMA is adsorbed almost totally by specific interactions, and this type of force is weaker in DMA and TMA, following the same trend as the dipolar mom ent of the adsorbates. There is evidence to support a dipole-dipole type ad sorbate-adsorbent interaction instead of an acid-base one.