Methods for the characterization of acid sites in FCC catalysts
Conference
·
OSTI ID:370740
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- West Point Military Academy, West Point, NY (United States)
The use of Temperature Programmed Desorption (TPD) of simple amines for the characterization of Bronsted sites in solid acids typically used in FCC will be discussed. It is shown that the ammonium ions formed by the interaction of amines with the acidic protons decompose to olefins and ammonia in a well-defined temperature range which allows the sites to be easily counted. It is found that the site density is not equal to the framework Al content in faujasites and only a small fraction of the Al in amorphous silica-aluminas result in Bronsted acidity. By normalizing rates for n-hexane cracking to the site densities on amorphous silica-aluminas, chemically dealuminated H-Y, steamed H-Y, and H-ZSM-5, important insights into the sites responsible for alkane cracking can be obtained.
- OSTI ID:
- 370740
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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