This article reports the effect of
adding zinc to an offretite
(OFF) zeolite. It is observed that zinc addition does not significantly
change the specific surface area, the pore volume, or the pore size
distribution. It is noticed, however, that zinc addition influences
acid properties of the OFF significantly. For instance, when employing
FTIR pyridine adsorption, it is observed that in the Zn-OFF, there
are 2.5 times higher Lewis acid sites than Brönsted acid sites.
Furthermore, when applying NH3-TPD, three acid sites were
identified: (a) abundant number of weak acid sites, (b) fair number
of moderate acid strength sites, and (c) scarce number of strong acid
sites. Furthermore, NH3 desorption kinetic parameters were
also calculated. Two numerical methodologies, linear and nonlinear
regression, were implemented. It was noticed that E
d augments with zinc as E
d for OFF < E
d for Zn(2.0 wt %)-OFF
< E
d for Zn(3.5 wt %)-OFF.
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