DEVELOPMENT OF NIMO/HY-?-AL2O3 CATALYST FOR ULTRA LOW SULPHUR DIESEL PRODUCTION

• Main Author: Gustiasih Maulidanti, Ellen
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42513
• Institution: Institut Teknologi Bandung

Consumption of diesel oil has relatively increasedfrom year to year. Sulphur is one of impurities that contained in diesel oil. The existence of sulphuris undesirable since it can pollute the environment. Diesel oil that has been produced in Indonesia currently has a sulphur content of 300 ppm so it needs to be studied in more depth on how to obtain diesel with sulphur content less than 50 ppm. NiMo-based catalysts play an important role in desulphurization process. This research focuses on modifying the catalyst support to obtain a NiMo catalyst with high catalytic activity. There are four stages of the process in this study, first, the making of HY-?-Al2O3support, second, catalyst impregnation, third, catalyst characterization, and the last is catalyst performance test. The main focus of this research is the process of making alumina supports with zeolite and HNO3 modifications. The developed catalysts were characterized by BET, XRD, and XRF and also its crushing strength. NiMo / Al10Y2 and NiMo / Al15Y1 catalysts are able to convert sulphur above 99%. This catalytic activity can be achieved because the catalyst average pore size are above 70 Å with specific surface area are above 245 m2 / g and the presence of zeolites can increase the rate of sulphur removal reaction up to 2.5-4 times faster. From this study it can be concluded that at a variation of 5% zeolite concentration, the addition of HNO3 concentration during peptization can affect the pore diametre and specific surface area of the catalyst. The greater concentration of HNO3, the smaller average pore diameter obtained and the greater surface area would be achieve. This trend is not seen in the variation of zeolite concentrations of 10% and 15%. Increasing the concentration of zeolite can increase the catalytic activity of the hydrodesulfurization reaction. The developed NiMo / HY-?-Al2O3 catalyst has better catalytic activity compared to commercial catalysts. Further research needs to be done on the effect of zeolite on hydrocracking activity. It is necessary to measure the acidity of the catalyst with NH3-TPD. Further studies are needed regarding the control of the physical properties of the catalyst without the addition of HNO3. Testing the catalyst stability and comparing the catalytic activity with the modified citric acid catalyst as a chelating agent.