Studies of Benzalkonium Chloride Micelle Formation as Mesoporogen in Pre-synthesis of Hierarchically Porous ZSM-5 Zeolite
Zeolite is one of the catalysts which is widely used in various industrial processes. Although there has been intensive research on the zeolite, formation of zeolite framework still leaves a lot of questions. This study is a continuation of the successfully synthesized hierarchically porous ZSM-5...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/32273 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Zeolite is one of the catalysts which is widely used in various industrial processes. Although
there has been intensive research on the zeolite, formation of zeolite framework still leaves a
lot of questions. This study is a continuation of the successfully synthesized hierarchically
porous ZSM-5 zeolite using benzalkonium chloride. Benzalkonium chloride in the presynthesis
interacts as zeolite precursors by forming micellar liquid crystal. These argument
were proved through the study of aggregation kinetics on zeolite precursors, zeolite
precursor bulk phase analysis, the value of Critical Micellar Concentration (CMC) and
phase-transition temperature of benzalkonium chloride. Critical Micellar Concentration
(CMC) was found at 1.8 mM which lies below the concentration of benzalkonium chloride
used in the synthesis of zeolite. Observation on changes in the value of conductivity due to
temperature rise on benzalkonium chloride showed the liquid crystal phase transition of
benzalkonium chloride at 35.6 oC. Addition of 4 mM NaOH to micellar solution pointed the
increase in phase transition temperature to 36.5 oC. It shows a tendency of the liquid crystal
stabilization by introducing ions to micellar solution. This research also performed
determination of the mean aggregation number of benzalkonium chloride micelles using
Fluorescence Quenching method (FQ) which can be used to determine the morphology of
benzalkonium chloride micelles. Anthracene sulfonate was used as a probe and CTAB (Cetyl
Trimethyl Ammonium Bromide) surfactant as quencher. The value of aggregation number
obtained from the experiment was 90. Thus, benzalkonium chloride micelles can be regarded
as spherical. Aggregation number of benzalkonium chloride is also associated with the
formation of macropores at ZSM-5 zeolite with spherical morphology in SDA-free synthesis
of ZSM-5 |
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