Abstract
1. The treatment of NaX and NaY zeolites with an inert gas (helium or argon) at 520‡C immediately after their high-temperature treatment with air significantly increases the activity of the catalysts in benzene hydrogenation. 2. Oxygen chemisorption on NaX zeolite at 550‡C was observed by a combination of thermal desorption and mass spectrometry. 3. The obtained data suggest that in high-temperature treatment of zeolites with air, oxygen is chemisorbed on them, and, in the subsequent presence of hydrogen, this oxygen forms water which deactivates the catalyst.
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More From: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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