Synthesisof Hierarchically Porous MFI Zeolite Using Bulky Cationic Surfactant as Mesopore Directing Agent

• Main Author: Zulfan, Rusdy
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/37893
• Institution: Institut Teknologi Bandung

Catalytic reaction involving the use of bulky molecules, such as biomass conversion, requires a porous catalyst with large access. In the case of zeolite to be used as catalyst, hierarchically porous type feature containing mesoporosity is being demanded, however hierarchically porous ZSM-5 (MFI-type zeolite) with mesopore larger than 15 nm is not yet reported thus far. Several types of surfactants have been utilized to generate mesoporosity. Typically, quaternary cationic surfactant is used to generate mesoporous in zeolite. In our research, we have tried bulky cationic quaternary surfactant, Benzalkonium Chloride (Sanisol) 99% in which the hydrophilic group is located in between the hydrophobic chains as the mesopore-generating agent for synthesizing hierarchically ZSM-5. Mesoporous zeolite was synthesized via hydrothermal treatment with starting parameter of H2O/Si = 20, Si/Al= 22.73, NaOH/Si = 0.45, TPA-Br/Si= 0.19 and 10 % w/v of surfactant. X-ray diffraction (XRD) revealed that zeolite was crystallized after 24 h showing typical pattern of MFI framework. Scanning electron microscopy (SEM) shows multi-layered cubic-type morphology with rugged surface that is quite different from conventional ZSM-5. From N2 adsorption-desorption isotherm, the synthesis for 72 h at 150 shows type IV and large pore size distribution centered at 18.7 nm. It can be concluded that cationic surfactant, Benzalkonium Chloride can be used as mesopore directing agent to synthesize hierarchically porous MFI zeolite.