The process catalyst plays a very important role in the economy. From statistics, more than 90% of chemical production processes and even more than 20% of industrial products are produced by catalytic steps. In the oil industry, also known as the oil refinery industry, the catalytic process is almost entirely present. The following diagram shows the worldwide consumption of the catalysis process: the largest oil refining catalyst is used in catalytic cracking while the largest volume products are alkylation and follow the FCC catalyst. Other catalysts also used in hydrotreating, hydrocracking, alkylation and reforming processes. There are many catalysts that can be used in the oil industry for each oil refinery process. The first process that involved the use of catalyst is the catalytic cracking process. In short, a catalytic process is used to break the large hydrocarbon bonds of the naphtha moiety into smaller chains and more useful material. For modern refinery processes, the fluid catalytic cracking (FCC) unit is widely used. It is the most important conversion process in oil refineries that use to convert the high-boiling hydrocarbon molecules of crude oil into more valuable products and useful gasoline. This process will take place at high temperature and high pressure without a catalyst. Therefore, a catalyst is used in this process to lower the temperature and pressure used. The newest catalyst used in the modern oil refinery is zeolite, a complex compound of aluminosilicates with large lattices of aluminum, oxygen, and silicon atoms that carry negative charge. It is desired for FCC catalyst because it has good high temperature stability, high activity, low coke production... half of paper... tion and also hydrogenation process. It is an active carrier to carry out the complementary reaction. High purity alumina as an acid functionality carrier can be moderated by controlling the amount of chloride added to the support. By combining the acid with metallic components, it forms a dual-purpose catalytic system that potentially converts low-octane naphtha and paraffins into high-octane gasoline. A promoter was added to increase the stability of the catalyst by moderating the rate of coke formation. Platinum-rhenium (Pt-Re) is one of the catalysts. Finally, there are few other catalysts that can be found in the petroleum industry and have played an important role in specific processes. Refer to the table below: Unit Operation Catalyst Catalyst Support Hydrodesulfurization Molybdenum Disulfide (MoS2) Alumina Support Ruthenium Disulfide Catalytic Reforming Platinum Rhenium Paladium