The effect of particle size in the range of 0.16−2.01 μm on the hydrothermal stability of H−Y
zeolite under hydrothermal treatment conditions similar to those used in FCC processes was
investigated. The average particle size of 0.45 μm was found to be the optimum particle size of
H−Y zeolite to retain a high percent crystallinity upon hydrothermal treatment. A new
correlation was developed by plotting the relative crystallinity (C/C
0) against the reciprocal of
the square root of the particle size (d
0) of Y zeolite. The correlation accurately predicts the
hydrothermal stability of Y zeolite in small to medium particle sizes for a given temperature.
For the larger particle sizes of Y zeolite (>0.45 μm), no exact correlation between particle size
and hydrothermal stability was found, probably because of the presence of more structural defects
in the zeolite, as shown by higher Brønsted/Lewis acid ratios.
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