SYNTHESIS OF HIERARCHICALLY POROUS ZSM-5 BY USING SYNERGISTIC AMOUNT OF STRUCTURE-DIRECTING MOLECULE OF N-METHYL PYRROLIDONE AND TETRAPROPYLAMMONIUM BROMIDE

• Main Author: PUSPITA NIM:10513010, AJENG
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25245
• Institution: Institut Teknologi Bandung

Hierarchically porous zeolite is an inorganic material which has applications in the petrochemical industry. The existence of a hierarchically porous in the zeolite sould accommodate a better molecular diffusion when mass transport process. The hierarchically porous zeolite synthesis method that has been discovered until now involves a fairly complex set of processes. One of the new discoveries in the zeolite field is the use of N-methyl pyrrolidone (NMP) in the synthesis of a hierarchically porous ZSM-5 which could direct the pore structure to form house-card-like morphology. This preliminary discovery still requires a further study to determine the mechanism of pore structure formation in ZSM-5 products. In this research, the synthesis reaction of hierarchically porous ZSM-5 is conducted through the synergistic amount of NMP and the ZSM-5 structue directing agent, namely tetrapropylammonium bromide (TPABr). This study is done to observe the effect of TPA+ ion addition to the ZSM-5 product morphology. ZSM-5 is synthesized with variations of NMP and TPABr mole composition. The synthesized products were then characterized using X-ray diffraction, infrared spectroscopy, Raman spectroscopy. Based on those characterization, all synthesized products have ZSM-5 structures. In morphology, the ZSM-5 products synthesized through the synergistic effects of NMP and TPABr were characterized using a scanning electron microscope and produced ZSM-5 with high crystallinity and possessed a new hierarchical pore morphology. Mechanically, the formed morphology is thought to be the result of coordination between NMP molecules which have high dipolar characteristic with cations from TPABr to form complex TPA+(NMP) bonds that affect the recrystallization process of aluminosilicates.