Interaction of water with the zeolite HY, studied by FT i.r.

✍ Scribed by L.M. Parker; D.M. Bibby; G.R. Burns

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 360 KB
• Volume: 11
• Category: Article
• ISSN: 0144-2449
• DOI: 10.1016/s0144-2449(05)80235-0

✦ Synopsis

The interaction of water with the Br6nsted acid sites of zeolite HY at 25 and 80°C, and subsequent decomposition of HY upon thermal desorption of the water, has been studied by FT i.r. If less than one molecule of water was sorbed per AI atom in the zeolite, the acid sites were fully restored after water desorption. When the amount of sorbed water was increased, permanent loss of Br6nsted acidity occurred on water desorption, along with collapse of the zeolite framework. Upon water sorption, the formation of new i.r. hydroxyl peaks was observed at 3710, 3675, and 3615 cm -~. These may be due to partial removal of AI from the lattice to form AIOH species, accompanied by the formation of internal silanol groups.