An in situ infrared investigation was conducted using four basic adsorbates to identify the acidic sites present onand aluminas. For two adsorbates, pyridine and 2,6-lutidine, adsorption studies were conducted between 298 and 983 K and at adsorbate pressures from 1.33 Pa (Pascal) to 1.33 kPa. The adsorption of acetonitrile and n-butylamine was conducted at 298 K by using adsorbate pressures from 0.66 to 8.65 kPa. Lewis acid and hydrogen-bonded complexes were identified on both aluminas for three adsorbates: acetonitrile, pyridine, and 2,6-lutidine. Using n-butylamine as the probe molecule, complexes for Bronsted, Lewis, and hydrogen-bonded sites were identified onand aluminas. Results from a calorimetric study of the aforementioned adsorbates and adsorbents are also discussed.

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