Studying the Interaction between Water Vapor and a γ-Al 2 O 3 Surface by IR Spectroscopy

The interaction between a γ-Al 2 O 3 surface and vapors of H 2 O and D 2 O is studied via IR spectroscopy. It is shown that surface hydroxyl groups of ОН and OD form at temperatures as low as 100–200°С. It is estimated that these hydroxyl groups exhibit Brønsted acidity, and their interaction with NH 3 leads to the formation of NH _4^ + ions.