THE FLUORINATION EFFECT ON THE CHARACTERISTIC AND ACIDITY OF HZSM-5 ZEOLITE

• Main Author: Polisenawati, Andriana
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/35058
• Institution: Institut Teknologi Bandung

The fluorination effect on the characteristic and acidity of HZSM-5 zeolite has been successfully investigated. This work was prepared in order to observe the effect of fluorination on the characteristic and acidity properties of HZSM-5 catalyst which is widely used in xylene isomerization process, as often founded in toluene disproportionation and methylation. Fluorination process is done through impregnation in NH4F solution followed by calcination at 500oC. Characterization was carried out by XRD (X-Ray Diffraction) analysis that is aimed to discover the type of zeolite and its crystallinity. Besides, Scanning Electron Microscopy (SEM) was done for determining the surface morphology of zeolite. Another act, XRF (X-Ray Fluorescence), was settled to quantitatively verify the molar ratios of Si/Al and composition of elements contained in zeolite. BET (Brunauer, Emmett, and Teller) was performed for obtaining the pore volume and surface area of zeolite, while Fourier Transform Infra Red (FT-IR) was intended to qualitatively identify Brønsted and Lewis acidity sites of the zeolite. The whole analysis was made on both pure HZSM-5 and fluorinated HZSM-5. In addition, this research also managed efforts for concluding Brønsted and Lewis acidity sites. As a result, the number of Brønsted and lewis acidity sites has been decreased significantly. However, the impregnation process in NH4F solution which triggers the occurrence of dealumination in HZSM-5 has not change crystallinity, pore volume, surface area, and molar ratio of zeolite catalyst.