Abstract
We have examined temperature-programmed desorption (TPD) and thermogravimetric analysis (TGA) of 2-propanamine on a fluid catalytic cracking catalyst as a function of steam deactivation time and compared the results to the activity for gas-oil cracking. The TPD-TGA results for the FCC catalyst are similar to results obtained on high-silica zeolites and show ammonia and propene desorbing in a well-defined feature between 575 and 650 K. The sites responsible for this desorption feature appear to be acid sites associated with framework Al in the zeolite phase. The concentration of these sites decreases steadily with steam deactivation and correlates very well with the activities for gas-oil cracking.
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