The process catalyst plays a very important role in the economy. According to statistics, more than 90% of the chemical manufacturing process and more than 20% of industrial products are produced by catalytic steps. In the petroleum industry, also known as the petroleum refining industry, the catalytic process is almost entirely used. The diagram below shows the global consumption of process catalysis: - The largest gasoline refining catalyst is used in catalytic cracking while the largest products are alkylation and follow FCC catalyst. Other catalysts are also used in hydrotreating, hydrocracking, alkylation and reforming processes. Many catalysts can be used in the petroleum industry for each petroleum refining process. The very first process involving the use of a catalyst is the catalytic cracking process. In short, a catalytic process is used to break the large hydrocarbon bonds in the naphtha fraction into a smaller chain and more useful material. For modern refining processes, fluid catalytic cracking (FCC) unit is widely used. It is the most important conversion process in oil refineries, used to convert high-boiling hydrocarbon molecules from crude oil into more valuable products and useful gasoline. This process will take place under 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 modern oil refineries is zeolite, a complex compound of aluminosilicates with large networks of aluminum, oxygen and silicon atoms carrying negative charges. It is desired for FCC catalyst because it has good high temperature stability, high activity, low coke production...... middle of paper ......tion and also hydrogenation process. It is an active support for carrying out the complementary reaction. High purity alumina as an acid functional support can be moderated by controlling the amount of chloride added to the support. By combining the acid with metal components, it forms a dual-function catalytic system that potentially converts low-octane naphtha and paraffins into high-octane gasoline. A promoter was added to increase catalyst stability by moderating the rate of coke formation. Platinum-rhenium (Pt-Re) is one of the catalysts. Finally, there are few additional catalysts that can be found in the petroleum industry that play an important role in a specific process. Refer to the table below: Unit operation Catalyst Catalyst support Hydrodesulfurization Molybdenum disulfide (MoS2) Alumina support Ruthenium disulfide Catalytic reforming platinum Rhenium Paladium