Catalytic Oxidative Desulfurization of Dibenzothiophene Utilizing Composite Based Zn/Al Layered Double Hydroxide

In this study, the Zn/Al-TiO: and Zn/Al-ZnO was successfully synthesized. The catalysts were characterized by X- ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), and Scanning Electron Microscope-Energy Diaper- sive X-ray Spectroscopy (SEM-EDS). The typical diffraction peaks of Zn/AI-LDH, TiO2, and ZnO still appear in the Zn/Al-TiO: and Zn/Al-ZnO composites, indicating that the composite preparation did not change the form of pre- cursors. FTIR spectra of Zn/Al-TiO, and Zn/Al-ZnO showed absorption band at 3448, 1627, 1381, 852, 779, and 686 cm(2)(1). The catalysts have an irregular structure where the percent mass of Ti and Zn on the composite at 10.6% and 55.6%, respectively. The acidity of Zn/AI-LDH composite increased after being composed with TiO, and ZnO. The percentage conversion dibenzothiophene on Zn/Ai-ZnO, Zn/Al-TiO2, ZnO, Zn/Al-LDH, and TiO; was 99.38%, 96.01%, 95.36%, 94.71%, and 91.92%, respectively. The heterogeneous systems of catalytic reaction was used for reusability. After 3 cycles catalytic reactions at 50 degrees C for 30 min, the percentage conversion of dibenzothiophene on Zn/Al-LDH, TiO2, ZnO, Zn/Al-TiO:, and Zn/Al-ZnO were 77.42%, 83.19%, 82.34%, 84.91%, and 89.71 %, respective- ly. The composites of Zn/Al-TiO, and Zn/Al-ZnO have better reusability test than Zn/Al-LDH, TiO2, and ZnO, which proofing that Zn/Al-TiO, and Zn/Al-ZnO have a stable structure.