This study emphasizes
tuning the synthesis conditions of MFI zeolites
to achieve better catalytic properties by optimizing the mesoporosity,
the balance between Brønsted and Lewis sites, and the zeolite
particle sizes. The MFI zeolites were hydrothermally synthesized at
various temperatures employing different silica sources. The synthesis
temperature was varied between 110 to 180 °C at constant synthesis
time (15 h). Different silicon sources led to variations in structure,
morphology, and size of the MFI zeolite along with tuned Lewis and
Brønsted acid sites in parallel correlation with shape selectivity
of the reaction. The catalytic activities of synthesized zeolites
were investigated in the catalytic cracking of
n
-dodecane
to produce value-added chemicals. The zeolite synthesized at 180 °C
using fumed silica presented the highest catalytic conversion (96.6%),
while maximum light olefin gaseous products (73.1%) were obtained
for the sample synthesized at 140 °C using tetraethyl orthosilicate
as the silica source. The MFI zeolite synthesized at 180 °C employing
tetraethyl orthosilicate as a silica source facilitated the formation
of both naphthenes and aromatics (71.3%) as major liquid products.
Nano BEA zeolite catalysts were synthesized and modified by desilication and then ion-exchanged with Co. The desilication was carried out using 0.1 M of NaOH.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.