Synthesis, Characterization, and Catalytic Ability Evaluation of Mgo-γ-Al2O3/Tio2-so4 2- for Transesterification of Waste Cooking Oil by Methanol

The catalytic system Mgo-γ-Al₂O₃/Tio₂-so₄ ^2- was synthesized, and then characterized by XRD, IR, NH3 - TPD, CO2-TPD, BET, EDX methods. As can be seen from the results of physical characterization, the synthesized Mgo-γ-Al₂O₃/Tio₂-so₄ ^2- material owns a large surface area of 261.85 m²/g, a mean capillary diameter of 95.5 Å. The presence of TiO2 and SO4 2- creates strong acid sites on the catalyst surface, as indicated by the NH3 desorption temperature peak at 509.5°C and 546.6°C. The presence MgO phase creates strong basic sites, as specified by the CO₂ desorption temperature peak at 502.1°C. A transesterification between methanol and waste cooking oil (the volume ratio of methanol to oil of 1:1) using Mgo-γ-Al₂O₃/Tio₂-so₄ ^2- as a catalyst was carried out at 120°C for 4 hours. The reaction efficiency was about 98.1%.