Abstract
The present study shows the effect of sodium contamination over the structural evolution of USY under conditions similar to the regenerator of an FCC unit. Increasing loads of Na+ (as NaCl) were added on a sample of commercial USY, and the admixtures were treated at fixed hydrothermal conditions. Sample evolution was followed by powder X-ray diffraction (XRD), Raman spectroscopy, nitrogen sorptometry, and scanning electron microscopy (SEM). The results of this research show that the materials amorphize irreversibly with increasing Na+ level, with a marked loss of microporosity, but interestingly, without a substantial depletion of framework aluminum. The structural map of the outcoming samples was figured out by XRD and Raman scattering experiments, showing that at the molecular scale the destruction occurs selectively on faujasite six-membered rings.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call