Synthesis of Zirconium-based Metal Organic Frameworks (Zr-MOFs) as Candidate for Support Material in Fischer-Tropsch Catalyst

• Main Author: ARVIAN DITASARI (NIM : 10510060) ; Pembimbing: Aep Patah, Ph.D , I Nyoman Marsih , Ph.D, AMANDA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/17908
• Institution: Institut Teknologi Bandung

Zirconium-based Metal Organic Frameworks (MOFs) which are Zr-BDC (UiO-66) and Zr-BPDC (UiO-67), had been successfully synthesized. MOFs are coordinated polymer compounds consist of metal ions and organic ligands as a linker which forms a three -dimensional framework. Larger surface area provides more opportunities for better dispersed catalysts on MOFs surfaces and it is expected to improve the catalytic activity. UiO-66 MOFs was synthesized by reacting ZrCl4 and benzene-1,4-dicarboxylic acid (BDC) in N,N-dimethylformamide (DMF) by using microwave and solvothermal method with the mole ratio of 1:1, whereas UiO-67 was synthesized using biphenyl-4,4- dicarboxylic acid (BPDC) as ligand. Characterizations of MOFs properties was performed using X - Ray Diffraction (XRD), Thermal Gravimetric Analysis (TGA), N2 physisorption, Scanning Electron Microscope (SEM), and IR spectroscopy. The diffraction patterns showed that MOFs which was synthesized by microwave-assisted has better crystallinity than by solvothermal. Thermogram showed the decomposition of UiO-66 occurred at range temperature of 530 °-580 °C while for UiO-67 at 530 ° - 600 °C. The BET surface area for UiO-66 which was synthesized by solvothermal and microwave-assisted method was 565.040 m2/g and 740.082 m2/g respectively. The BET surface area for UiO-67 resulted from solvothermal synthesis method was 24.392 m2/g, while for the microwave method was 74.325 m2/g. Catalysts were synthesized by using incipient wetness impregnation of 10% w/w cobalt from cobalt nitrate solution and calcined at 350 oC for 6 hours. Impregnation resulted in changes to the structure of UiO-67 but not in UiO-66. Typical peaks of Co3O4 appear in the catalyst diffractogram after impregnation, both in UiO-66 and UiO-67. The BET surface area of UiO-66 and UiO-67 MOFs after impregnation was 205.104 m2/g and 11.812 m2/g respectively. The Co3O4 particles were suggested covers the pores on MOF’s surface and hence decrease the surface area. It can be concluded that microwave method is a better method in the synthesis of UiO-66 and UiO-67 MOFs in terms of crystallinity.UiO-66 MOFs showed a good structure stability than UiO-67 especially for dispersing the cobalt particles to its structure after impregnation