STUDY OF FAU INTERZEOLITE TRANSFORMATION AND APPLICATION OF CONFINED-REACTIVE AGENT TECHNIQUE

• Main Author: Septioga, Kevin
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/62771
• Institution: Institut Teknologi Bandung

Interzeolite transformation is one of the zeolite synthesis methods to solve problems in zeolite waste treatment. With this method, the waste zeolite can be converted into a new and more functional zeolite. The interzeolite transformation method can be carried out with the assistance of Organic Structure Directing Agent (OSDA), seed-assisted, and without OSDA/seed-assisted. The use of non-specific organic compound as OSDA in transformation interzeolite can be applied to confined-reactive agent technique. With this confined-reactive agent technique, the organic compound act to increase reactivity especially in transformation of zeolite parent. As example, TEAOH compound is specific OSDA for formation of zeolite BEA (beta) can be used in transformation of FAU (faujasite) to produce CHA (chabazite). For information, TEAOH is an organic compound that is not specific in producing CHA aluminosilicates. Therefore, the TEAOH compound can act as a reactive agent rather than as a structural director. In this research, the transformation of faujasite interzeolite with the confined-TEAOH technique has been successfully carried out. The zeolite produced in the FAU framework transformation is a CHA and MER framework zeolite using TEAOH as OSDA. XRD, XRF, and SEM characterization performed analysis related to crystal phase, morphology, and Si/Al ratio. Based on the analysis results, it is known that the FAU zeolite produced from metakaolin has a flower-like morphology with a Si/Al ratio of 1.88. FAU protonated with NH4NO3 showed the occurrence of Al dissolution in the FAU framework, which was indicated by an increase in the Si/Al ratio to 2.50, and protonation damaged the crystal morphology. KOH concentration, temperature, and time of synthesis influenced FAU interzeolite transformation by KOH concentration, temperature, and synthesis time. At higher concentrations of KOH, FAU (FD:13,3 T/1000Å3) transformed a framework with a higher Framework Density (FD), namely CHA (FD:15.1 T/1000Å3) and MER (FD:16, 4T/1000Å3). In this study, the interzeolite transformation was successful at 130 °C, 150 °C, and 170 °C. At 130 °C, the transformation of FAU to CHA was successful at higher concentrations. Meanwhile, at a temperature of 150 °C, CHA zeolite was formed at a lower concentration of KOH, and MER zeolite was formed at a higher concentration. The synthesis time determines the type of zeolite framework produced. Hydrothermal at a temperature of 170 °C for 2 days produced CHA zeolite while at 5 days MER zeolite was formed. So the interzeolite transformation route obtained in this study is FAU?CHA?MER. Interzeolite transformation with confined-OSDA technique was performed at 170 °C for 2 days. It is known that formation of MER framework is faster than conventional technique without OSDA. The presence of TEA+ ions in the FAU framework plays a role in increasing the reactivity of the parent zeolite to transform. causes CHA nucleation to be faster so that CHA can turn into MER. This study provides insight into the route of interzeolite transformation and the role of confined-OSDA that is useful for improving the rate of transformation of the parent zeolite into a target zeolite.